| Chevrolet Head Casting Number Reference Small Blocks 330545 350 73 Corvette 76cc 2.02 / 1.6 Valves 333881 350 74-75 76cc 2.02 / 1.6 Valves 333882 350-400 74-80 76cc 160 / 60cc Ports 340292 "Turbo" Angle Plug, 64cc, 2.02 / 1.6 valves 354434 262-267-30575-79 163/57 cc Ports Light Weight Casting 358741 305 76-79 376450 262,305,350 84-81 168 / 60cc Ports 376455 350 77-85 458642 350-400 67-70 462624 350-400 75-86 161 / 62cc Ports 468642 350-400 76-80 Small Spark Plugs 471513 267,350 79 517513 267,350 79 3030817 400 74 3636839 265 55 3703523 265 55 Corvette 3703524 265 55 3713358 265 55-56 3713569 265 55-56 3720991 265 56-57 3731262 265 56 2 4 Barrel Carburetors Corvette 3725306 265 56-57 3731539 57 Corvette Fuel Injected 3731544 283 57-61 3731548 283 57-62 3731554 283 57-61 3731556 283 57 Truck 3731762 265 2 4 Four Barrel Carburetors 56 Corvette 3737739 283 57-62 Corvette Fuel Injected 3737775 283,327 62-67 3740997 283 57 3743056 283 58 3743096 327 62-67 G.M.C Truck 3747363 283 57-61 3747460 283, 327 59-67 3748720 283 57-58 3748770 283 1 - 4 Barrel and , 2 - 4 Barrel Carburetor, Corvette Fuel Injected X 58, With Staggered Valve Cover Bolts 3748772 283 58-61 3755537 283 57-62 3755539 283 58-62 Staggered Valve Cover Bolts 3755549 283 57-62 3755550 283 59 Corvette Staggered Valve Cover Bolts 3755585 327 62-67 G.M.C Truck 3756519 283 57-62 3760116 283 60-64 3767460 283,327 60-64 3767462 327 62-67 161 / 65cc Ports 3767465 283 59-61 3767754 283 59-61 Power Pack Heads 3767792 283 60-64 3770126 327 69 3774682 283, 327 60-64 3774684 327 62-64 Passenger Car and Truck 3774692 283 60-61 Corvette 3774692 283 58-64 Passenger or Power Pack Head 3782461 327 64-66 Double Hump or Camel Hump 161 / 62cc Ports 3782461X 327 60-63 Larger Intake Runners, 172 / 64cc Port (other notes suggest Fuel Injection) 3782870 327 62-37 3789817 327 62-67 3789935 283 57-62 3790721 283 64-67 3792563 327 65-67 3795896 283 63-65 Power Pack Heads 3795896 327 62-64 Corvette 250 HP 140 / 60cc Ports 3798996 327 63-67 3814480 283, 327 60-67 3814482 327, 350 62-67 75cc Low Compression Heads 3817680 283, 327 63-67 3817681 327, 350 62-67 3817682 283 61-62 3836839 265 55 3836842 283,327 57-67 3837064 265, 283 56-62 3837065 265 55-56 Truck 3837739 283 57 3848720 283 57-58 3849852 283 57-67 3849935 283 65-67 3852174 327 62-64 3854520 283, 327 62-67 140 / 60cc Ports 3870064 265, 283 56-62 3870065 265 55-56 Truck 3876775 283, 327 210 HP Camaro Accessory Bolt Holes on one end only 3884520 283, 327 60cc 3890462 302, 327 350 Camel Hump or Double Hump 161 / 165cc Intake Port 3901068 350 285HP Crate Engine 64cc, 72º Intake Bolt Angles 3911032 307, 327 68 Without Accessory Bolt Holes 3912264 283 58-62 3912265 283 63-64 3912311 327 67 3912313 327 65-67 3917290 307, 327, 67-68 142 / 59cc Ports 3917291 302, 327, 350 Camel Hump or Double Hump 161 / 65cc Ports 3917292 327 350 68 Corvette Camel Hump or Double Hump 3917293 307, 327 75cc 144 / 58cc Ports 3927185 307, 327 69cc 69-70 3927186 302, 350 Camel Hump or Double Hump 63cc Chamber 161 / 65cc Ports 3927187 350 69-70 Camel Hump or Double Hump 64cc 3927188 307, 74cc 3928455 302, 327 68 3928494 327, 350 68 3928495 327 68 3931633 307 68-72 3931635 250 68-76 3931637 327 68-69 3931638 327 68 Truck 3932441 350 76cc 161 / 165cc Intake Port 3932441X 350 80cc 1.94 / 1.5 Valves 161 / 65cc Port 3932441X 400 80cc 1.94 / 1.6 Valves 161 / 65cc Intake Port 3932454 307 69 3946812 350 69 3946813 350 69-70 138 / 72cc Ports 3747041 302, 350 64cc 3951598 400 70 76cc 3964286 350 3970126 327, 350 67-70 3973414 350 70 LT-1 64cc Camel Hump or Double Hump Heads 3973487 350 71-76 3973487 350 LT-1 75cc 161 / 165cc Intake Port 3973487X 350 75cc Larger Intake Ports 3973493 400 71 76cc 3986316 350 71 Corvette 76cc 3986336X 350 76cc 3986388 307, 350 68-76 3986339 307, 350 71 75cc 3986339X 307,350 75cc 3991492 350 70 LT-1 64cc Straight Plugs Camel Hump or Double Hump 3991492 70 Straight or Angle Plugs 64cc 157 / 62cc Ports 3998916 350 LT-1 76cc Screw in Rocker Arm Studs 3998920 350 72-73 3998991 307,350 73 75cc Hardened Valve Seats 3998991 307, 350 72-73 75cc 3998993 307, 350 73 75cc Hardened Valve Seats 3998993 307, 350 72-73 76cc 164/64cc Ports 3998993 350 Crate Mexico Made 159/64cc Ports 3998993 350,400 73 76cc Hardened Valve Seats 3998997 350, 400 72-73 76cc 3998997 305, 350 161 / 165cc Intake Port Hardened Valve Seats 4079261 350 75 10033867 Pontiac Aluminum Racing Heads Angle Plugs 62cc - 196cc Intake Port 23º 2.10 -1.625 Valves 10045434 Pontiac Aluminum Racing Heads Angle Plugs 55cc Raised Intake Runner 15º Roll Over 10051101 Bow Tie Aluminum Angled Plugs 55cc Raised Intake Runner 196cc Intake Port 10088113 350 88-93 Corvette Aluminum Angled Plugs 58cc 1.94 -1.5 valve Super Light Weight 10106178 350 90 LT-5 and ZR-1 Dual Over Head Cam 32 Valve Passenger's Side 10106179 350 90 LT-5 and ZR-1 Dual Over Head Cam 32 Valve Driver's Side 10110810 350 93 Generation I 10128374 350 Generation II LT-1 53cc Angled Plugs Corvette Aluminum Reverse Flow Cooling System 168-175 cc Intake Port 10134352 Bow Tie Low Port Aluminum with 18º Angled Plugs 45cc 223cc Intake Ports 10134363 Bow Tie High Port Aluminum with 18º Angled Plugs 45cc 210cc Intake Ports 10134363 Bow Tie High Port Aluminum with 18º Angled Plugs 60cc 215cc Intake Ports 10134363 Bow Tie High Port, Aluminum with 18º Angle Plugs 50cc 250cc Intake Ports CNC Machined 2.15 / 1.625 Valves 10134363 Bow Tie High Port Aluminum 18º Angle Plugs 65cc 250cc Intake Ports CNC Machined 2.15 / 1.625 Valves 10134363 Bow Tie High Port Aluminum 15º Angle Plugs 36cc 223cc Intake Ports 10174389 350 90-95 LT-5 and ZRI Dual Over Head Cam 32 Valve Driver's Side 10174390 350 91-95 LT-5 and ZRI Dual Over Head Cam 32 Valve Passenger's Side 10185040 Symmetrical Port splayed valve Aluminum 45cc 263cc Intake Port 1st design 10185040 Symmetrical Port splayed valve alm, 45cc, 263cc intake port, 2nd. design 10205245 350 93 Generation II LT-1 Aluminum Reverse Flow Cooling System 168-175 Intake Port 10207643 350 94-96 Generation II LT-1 Aluminum Reverse Flow Cooling System 10225121 350 94-95 LT-1 and ZR1 Dual Over Head Cam 32 Valve Driver's Side 10225122 350 94-95 LT-1 and ZR1 Dual Over Head Cam 32 Valve Passenger's Side 10239902 350 96- Generation II LT-4 Aluminum Reverse Flow Cooling System 10239906 350 Vortec 5700 L-31 64cc Heart Shaped Chamber 1.94 / 1.5 170cc Intake Ports 14010201 305 84 14011034 Bow Tie Phase 2 Iron Angle Plugs 64cc 2.02 / 1.6 184cc .080 Taller Intake Ports 14011039 350 High Performance Replacement Aluminum 14011049 Bow Tie Phase 6 Aluminum Angled Plugs 55cc 2.02 / 1.6 or 2.1 / 1.65, 180cc Intake Ports 14011083 350 300 HP Crate Engine 64cc 90º Manifold Bolt with Hardened Valve Seats 14011083 350 87-95 64cc Center Bolt Valve Covers 72º Manifold Bolt 14014415 267, 305 80-85 14014416 305 80-85 High Output 58cc 1.84 / 1.5 165/59cc Ports 14022601 267, 305 80-85 High Output 58cc 1.84 / 1.5 14022801 305 80-85 14071114 350 80-85 14079261 350 86 14096217 350 285 HP Crate Engine 1.94 / 1.5, 72º Intake Bolts 64cc Center Bolt Valve Covers 14101081 305 87-88 Camaro Center Bolt Valve Covers 14101083 350 285 HP and 300HP Crate Engine 1.94 / 1.5 72º Intake Bolts 14101128 350 86-87 Aluminum Corvette with Angled Plugs 58cc 14102187 305 87-91 High Output 1.85 / 1.5 58cc 14102191 305 87-95 350 Center Bolt Valve Covers 14102193 305, 350 87-95 24502559 Bow Tie Aluminum Mirror Ports More Castings 33417369 350 Generation I Crate Engine Mexico Made 76cc 1.94 / 1.5 Flange Valve Cover Heavier Casting 366298 Bow Tie, Aluminum Billet Main Caps 3.398" Bore with Sleeves Two Piece Rear Main Seal 366299 Bow Tie Aluminum Nodular Iron Splayed Main Caps 4.00" Bore 389257 302 67 2 Bolt Main Caps 393288 283 65-67 2 Bolt Main Caps 460703 350 78 4 Bolt Main Caps 460776 305 78-79 2 Bolt Main Caps 460777 305 78-79 2 Bolt Main Caps 460778 305 78-79 2 or 4 Bolt Main Caps Some Canadian Assembled Heavy Duty Truck Blocks Have 4 Bolt Main Caps 471511 267 79-82 2 Bolt Main Caps 3556519 283 58-61 2 Bolt Main Caps 3703524 265 55 2 Bolt Main Caps No Oil Filter (This Casting Design Was Short Lived For Obvious Reasons) 3720991 265 56-57 2 Bolt Main Caps 3731548 265 57 2 Bolt Main Caps No Side Motor Mounts (This Engine Mount Was Attached to the Front) 3731548 283 57 2 Bolt Main Caps No Side Motor Mounts (This Engine Mount was Attached to the Front) 3737739 283 58-64 2 Bolt Main Caps 3756519 283 58-62 2 Bolt Main Caps 3782870 327 62-67 2 Bolt Main Caps 3789817 283 62-64 2 Bolt Main Caps 3789817 327 62-67 2 Bolt Main Caps 3789935 283 61-67 2 Bolt main Caps 3790721 283 62-64 2 Bolt Main Caps This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss 3790721 327 65-66 2 Bolt main Caps This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss 3791362 327 62-67 2 Bolt Main Caps This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss 3792563 327 65 2 Bolt Main Caps 3792582 283 64-65 2 Bolt Main Caps 3794226 283 58-63 2 Bolt Main Caps 3794460 327 62-64 2 Bolt Main Caps 3830944 327 63 2 Bolt Main Caps 3834810 283 64-66 2 Bolt Main Caps 3834812 283 62-63 2 Bolt Main Caps 3837739 283 58-62 2 Bolt Main Caps 3849852 283 57-66 2 Bolt Main Caps 3849935 283 65-67 2 Bolt Main Caps 3858174 327 64-67 2 Bolt Main Caps 3858180 327 64-67 2 Bolt Main Caps 3858618 350 68-76 2 Bolt Main Caps 3862194 283 65-67 2Bolt Main Caps This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss 3862812 283 62-64 2 Bolt Main Caps 3892657 302 67 2 Bolt Main Caps Camaro Z-28 3892657 327 67 2 Bolt Main Caps 3892657 350 67 2 Bolt Main Caps Camaro 3896944 283 66-67 2 Bolt Main Caps 3896948 283...66-67...2 3903352 327.....67....2 3914636 307.....68....2 3914638 307.....68....2 3914653 307...68-73...2 3914660 327.....68....2 3914678 302.....68....2...Z-28 Camaro 3914678 327.....68....2 3914678 350.....68....2 3931174 307.....68....2...Truck 3932371 307...69-73...2 3932373 307...68-73...2 3932386 302.....69....4...Z-28 Camaro 3932386 327.....69....2 3932386 350.....69....4 3932388 327.....69....2 3932388 350.....69....2 or 4 3933180 327...68-69...2 3951509 400...70-71...4 3951509 400...74-80...2 3951511 400...70-73...4...Some replacement blocks had 2-bolt main caps 3956618 302.....69....4...Z-28 Camaro 3956618 327...68-69...2 3956618 350.....69....2 or 4 3956632 307.....69....2 3959512 327...62-67...2...Was also used for some "CE" replacement blocks 3959532 283...64......2...Used for some "CE" replacement blocks 3959538 327...........2...Chevy II recessed oil filter boss, Used for some Chevy II "CE" replacement blocks 3970010 302.....69....4...Z-28 Camaro 3970010 327.....69....2...Trucks and industrial 3970010 350...69-80...2 or 4 3970014 350...70-76...2 or 4 3970020 307...69-73...2 3970024 307...69-73...2 4715111 305.....80....2 6259425 350...69-76...2 140029 350...80-84...2 330817 400...72-80...2 355909 262.....75....2 355909 305...76-79...2 360851 262...75-76...2...Monza V-8 361979 305...77-79...2 or 4, some Canadian assembled heavy duty blocks have 4-bolt main caps 366245 350...78-79...4...Bowtie 366286 4...Bowtie, siamesed straight nodular iron main caps, 2-piece seal, 4.00-4.150" bores, 2.45" main journals 10036033...350...........4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10046164...305.....86....2 10049804.................4...Aluminum, Pontiac Super Duty version of Gen.I SBC, 4.00" bore, 350 mains, 2-piece rear seal, splayed caps, GTP race block 10051182.................2 or 4...Bowtie, 3.75"-4.30" bores, 1 or 2-piece rear seal 10051184.................4...Bowtie, 4.00"-4.155" bores, 1 or 2-piece rear seal 10054727...350...86-up...2 or 4...one piece rear seal, some "Made in Canada" 10066036...350...........2 or 4...Target Master/Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10066038...350.....92....4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" 10090511...350.....90....2...LT-5, ZR1 Vette, 375hp 10125327...350...92-up...2 or 4...Gen.II LT-1, reverse flow cooling 10125327...350...96-up...2 or 4...Gen.II LT-4, reverse flow cooling 10134398.................4...Bowtie, Aluminum, 4.125" bore, 2.65" main journals 10134996.................4...Bowtie, Aluminum, 4.125" bore 2.65" main journals 10153558...350...91-92...4...LT-5, ZR1 Vette, 375hp 10168588...265...94-96...2...L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling 10199001...350...93-95...4...LT-5, ZR1 Vette, 405hp 10243878...305...96-98...2...Vortec truck, roller cam, one-piece rear seal 10243880...350...95-00...2 or 4...Vortec truck, Gen.I crate motors and "ZZ4", roller cam, one piece rear seal 12550592...350...97-up...crossbolted block, Gen.III, "LS1", aluminum 12551358.........99-up...Gen.III, 4.8L or 5.3L, cast iron, truck 12551364...364...98-04...crossbolted cast iron Gen. III, 6.0L, truck 12559378...350...99-up...crossbolted block, Gen.III, "LS1", aluminum 12559846...350...98-up...crossbolted block, Gen.III, "LS1", aluminum 12560621...350...98-up...crossbolted block, Gen.III, "LS1", aluminum 12560626...350...99-up...crossbolted block, Gen.III, "LS1", aluminum 12560629...350...99......crossbolted block, Gen.III, "LS1", aluminum 12561168...350...01-up...crossbolted block, Gen.III, "LS1", aluminum 12562174...350...98-up...crossbolted block, Gen.III, "LS1", aluminum 12568952...364...05-up...crossbolted block, Gen.III, 6.0L, aluminum, LS2 12566910...325...04-up...crossbolted block, Gen.III, 5.3L, aluminum, SSR truck 12571048...325...04-up...crossbolted block, Gen.III, 5.3L 12573581...364...98-04...crossbolted cast iron, Gen.III, 6.0L, truck 12577184...364...98-04...crossbolted cast iron, Gen.III, 6.0L, truck 12577396.........02-up...Gen.III, 4.8L or 5.3L, cast iron, truck 14010201...305...80-85...2 14010202...305...80-85...2 14010203...305...80-85...2 14010207...350...80-85...2 or 4 14010209...350...80-85...2 or 4 14010280...267...79-82...2 14011064...350...83......4 14011148...350...87-89.......Roller cam, one-piece rear seal 14016376...267...79-82...2 14016379...350...77-79...2 or 4 14016381...305...80-84...2 14016382...305...79-84...2 14016383...305...80-85...2...Truck 14079287...350...86-90.......Truck 14088526...350...87-89.......Roller cam, one-piece rear seal 14088548...350...86-88...2 or 4 14088551...305...86-87...2...one-piece rear main seal 14093627...305...87-94...2...Roller or flat tappet cam, one-piece rear seal 14093638...350...87-95...2 or 4...Roller or flat tappet cam, one-piece rear seal 14094766...305...86-up...2...One-piece rear seal 14101147...305...85-up...2 14101148...350...86-90...4...One-piece rear seal 14102058...305...87-91...2...Roller cam, one-piece rear seal 22551656.................4...Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump, 2-piece rear seal, 9.025" deck 330545.....73......350..........76cc chamber, 2.02/1.60 333881.....74-75...350..........76cc chamber, 2.02/1.60 333882.....74-80...350/400......76cc chambers 340292.....70's.......Over the counter, angle plug, 64cc chamber 354434.....75-79...262/267/305...60cc chambers 358741.....76-79...305 376445.....77-85...350..........76cc chamber, small valves 376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber 462614.....77-79...305..........60cc chamber 462624.....75-86...350/400......76cc chamber, 1.72/1.5, 1.94/1.5 or 2.02/1.6 valves 458642.....75-84...350..........350 468642.....76-up...350/400 471513.....79......267/350 517513.....79......267/350 1816887....63......283..........Made in "Canada", GMC HD truck 3636839....55......265 3703523....55......265 3713358....55-56...265 3713569....55-56...265 3725306....56......265 3731539....57......283..........283 HP FI 3731544....57-61...283 3731554....57-62...283 3731556....57......283..........Truck, Made in Canada 3731762....56......265..........Vette, 2x4 carbs 3737775....62-67...283/327 3740997....57......283..........1x4, 2x4 & FI (exc.-283hp) 3743056....58......283 3743096....62-67...327..........GMC Truck 3747363....57-61...283 3747460....59-67...283/327......70cc chambers 3748770....58......283 3748772 58-61...283 3755537 57-62...283 3755539 58-62...283 3755549 57-62...283 3755550 59......283 3755585 62-67...327..........GMC Truck 3767460 59-60...283 3767462 62-67...327 3767465 59-61...283 3767754 59-61...283..........60cc chambers 3767792 60-64...283 3774682 60-64...283/327......70cc chambers 3774684 62-64...327..........75cc chambers 3774692 58-64...283..........60cc chambers 3782461....64-66...327......Camel hump,no accessory holes,160/62cc port volumes,62cc chamber 3782461X...60-63...283/327..Camel hump,no accessory holes,larger 172/64cc port volumes, 62cc chamber 3795896....63-65...283......60cc chamber 3795896....62-64...327......60cc chamber 3798996....63-67...327 3814480....60-67...283/327..70cc chambers, 1.72/1.5 valves 3814482....62-67...283/327/350..75cc chambers 3817680....63-67...283/327 3817681....62-67...327 3817682....61-62...283 3836839....55......265 3836842....57-67...283/327 3837064....56-62...265/283 3837065....55-56...265..........Truck 3848720....57-58...283 3876775....60-67...283/327......75cc chamber 3884520....60-67...283..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker 3884520....62-67...327..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker 3890462....66-67...302/327/350..Camel hump,no accessory holes,64cc chamber 3901068....87-up...350..........Crate motor, 285hp, 64cc chamber 3911032....68......307/327......70cc chamber 3912264....58-62...283 3912265....63-64...283 3912311....65-67...327 3912313....65-67...327 3917290....67-68...307/327 3917291....67-68...302/327/350..Camel hump,no accessory holes,64cc chamber 3917292....68......327/350......Camel hump,64cc chamber 3917293....67-68...307/327......75cc chambers 3927185....69-76...307/327/350..70cc chambers 3927186....69-70...302/350......Camel hump,64cc chambers,accessory holes 3927187....69-70...350..........Camel hump,64cc chambers,accessory holes 3927188....69......327..........74cc chambers 3927188....70......307..........74cc chambers 3931633....68-73...307 3931635....68-76...350 3931638....68......327..........Truck 3932441....69-70...350..........76cc chambers 3932441X...69-70...350/400......80cc chambers 3932454....69-73...307 3932454....69-79...350..........Truck 3946812....69......350 3946813....69-79...350..........Truck 3947040....68......327.........."Right angle" casting identifier, 64cc chambers, good HP head, used in trucks, no accessory holes 3947041....69-70...302/350......"Right angle" casting identifier, 64cc chamber, accessory holes, good HP head 3947041X...69-70...302/350......"Right angle" casting identifier, 64cc chamber, 165cc intake port, accessory holes, good HP head 3951598....70......400..........76cc chambers 3964286............350 3965742....70......350..........over the counter, angle plug 3970126....67-71...327/350 3973370....69-70...350..........over the counter in US, Canadian 350/300hp production use in Pontiac, 64cc, straight or angle plug 3973414....70......350..........LT1-370hp, Camel hump, 64cc chamber 3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber 3973487X...71-72...350..........75cc chamber 3973493....71-72...400..........76cc chamber 3986316....71......350..........76cc chamber 3986336....71......350..........76cc chamber 3986336X...71......350..........76cc chamber 3986339....71......307/350......74cc chamber 3986339X...71......307/350......74cc chamber 3986388....68-76...307/350 3991492....70......350..........LT1,Camel hump,accessory holes,64cc, straight plug 3991492....70-up................over the counter,Camel hump,64cc, straight or angle plug 3998916....72......350..........also used w/'72 350 LT1,big valves, screw in studs,76cc chambers 3998920....72-73...350 3998991....72-73...307/350......75cc chambers 3998993....72-73...307/350......75cc chambers 3998993....current..350.........Goodwrench crate motors,"Hecho en Mexico",75cc chambers 3998997....72-73...350/400......76cc chambers 3998997....78-84...305/350......76cc chambers 4079261....75......350 10033867........................Aluminum,over the counter Pontiac 23' head,62cc,angle plug, 196cc intake port 10045434........................Over the counter Pontiac 15' head 55cc, angle plug, raised runner aluminum, "roll over" head 10051101........................Bowtie, aluminum, 55cc, angle plug raised runner, 196cc intake port 10065202...87-95...350..........Truck 10065203...87-95...350..........Truck 10065204...87-95...350 10065205...87-95...305 10065206...87-95...350 10065207...87-95...305 10088113...88-up...350..........Aluminum, 58cc, angle plug, raised "D" port exhaust, 1.94"/1.5" valves 10093328........................Over the counter, Pontiac 15' head aluminum,224cc ports, 61cc chambers, "roll over" head 10106178...90......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum 10106179...90......350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum 10110810...91-up...350..........Gen. 1, 65cc chambers 10120928...87-95...350 10125320...94-96...350..........Gen.II LT1, cast iron version, used on "9C1" Police package, Impala SS, Cadillac Fleetwood, Buick Roadmaster reverse flow cooling 10128374...92-up...350..........Gen.II LT1, 53cc, angle plug, aluminum, reverse flow cooling, 175/68cc ports 10134352........................Bowtie, 45cc, angle plug, "low" port, 223cc intake port, aluminum, 18' race head 10134363........................NOTE: This casting # has been used in many different versions of this aluminum 18' and 15' Bowtie race head. Different chamber volumes, port volumes, port locations, valve sizes, etc. were used. Check this casting carefully to determine which features it may have. There are at least 6 different versions as of 11/99. 10147898...95-98...350..........Gen.I crate motor 10159550...87-95...350 10159551...87-95...305 10159552...87-95...350 10159553...87-95...305 10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum 10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum 10185040........................Bowtie, aluminum, 45cc chambers, 1st version, symmetrical ports, 263cc intake ports, splayed valves 10185040........................Bowtie, aluminum, 45cc chambers, 2nd version, symmetrical ports, 240cc intake ports, splayed valves 10205245...93......350..........Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes 10207643...94-96...350..........Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes 10208890...94-96...265..........Gen.II, L99, 4.3 Liter V-8, cast iron, reverse flow 10215339...97......350..........Gen.III, LS1, aluminum, 68cc 10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum 10225122...95......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum 10239902...96-up...350..........Gen.II LT4, aluminum, reverse flow cooling, 195cc port, 54.4cc chamber, angle plug 10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber, 170cc intake port, 1.94"/1.5" valves 12367712...99-up................"Fast Burn", aluminum, 210cc intake, port, 2.00/1.55 valves, 62cc chamber 12367713...99-up................"Fast Burn" used on ZZ430 crate motor, aluminum, 210cc intake port, 2.00/1.55 valves, 62cc chamber 12480005...2000.................LS1 "GTZ", aluminum, 38cc, 2.125"/1.625" valves, angle plug 12480011...97-up................Bowtie "SB2.2", aluminum, 2nd version of "SB2", 48cc chambers, "mirror ports", revised valve angles & plug location 12506450...87-95...350 12509859...87-94...305 12516852...87-95...350 12529742...95-96...265..........Gen.II, "L99", cast iron 12551561...96......350..........Gen.II, "LT1", aluminum 12552520...97-up...305..........Vortec, truck 12554290...94-96...350..........Gen.II, "LT1", cast iron version, used on "9C1" Police package, Impala SS, Cadillac Fleetwood, Buick Roadmaster reverse flow cooling 12554291...95-96...265..........Gen.II, "L99", cast iron 12555690...96......350..........Gen.II, "LT4", aluminum 12556743...99......325..........Gen.III, 5.3L, aluminum, truck, van 12558059...97......305..........Vortec, truck, 1.84"/1.5" valves 12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port 12558806...97-98...350..........Gen.III, "LS1", aluminum, 68cc 12559853...99-up...350..........Gen.III, "LS1", aluminum, 68cc 12559862...99-00................Gen.III, aluminum 4.8/5.3L 12559895...00-up...325..........Gen.III, aluminum, Vortec 5.3L 12561706...01-04................Gen.III, 5.3L, aluminum 12561873...99-01...364..........Gen.III, 71cc, iron 12562317...01-04...364..........Gen.III, 71cc, aluminum 12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc 12564243...01-up...350/364......Gen.III, "LS6", "LS2", aluminum 12572035...01-04...364..........Gen.III, 6.0L, aluminum, 71cc 14008856...79-81...267 14010201...82-85...305 14011034........................Bowtie, cast iron, 64cc chambers, 184cc port volume, angle plug, "Phase II" head 14011049........................Bowtie, aluminum, 55cc chambers, angle plug, 180cc ports, "Phase 6" 14011083...55-86...350..........Crate motor for years indicated. 285/300hp, 64cc chambers, 1.94"/1.5" valves 14014415...80-85...267/305 14014416...80-86...305..........1.84"/1.5" valves, 58cc chambers 14014440...80......305..........1.84"/1.5" valves 14019821...80-86...350 14019924...79-81...267 14019926...80-86...350 14010516...80-86...350 14020517...80......350 14020555...81......305 14020556...81......350 14022056...85......350 14022206...80......350 14022301...80-86...305 14022601...80-86...267/305......1.72"/1.5" or 1.84"/1.5" valves, 53cc chambers 14022801...80-86...305 14024816...........350..........76cc chambers, 1.94/1.5 valves, Gen.I crate motors 14034806...78-82...267 14034807...78-86...305 14034808...80-86...350 14034808...96-up...350..........76cc chambers, 1.94"/1.5" valves, Gen.I Goodwrench crate motors 14034810...80-86...350..........Truck 14034811...80-86...350..........Truck 14039121...81-86...305..........Truck 14039122...81-86...305..........Truck 14071114...80-86...350 14075381...80-86...350..........Truck 14079261...86......350 14085844...80-86...350..........Truck 14085963...86......350 14088526...........350..........Gen.II, LT1, aluminum 14089119...86-88...350 14094093...86-88...350 14096217...55-86...350 Crate285hp/300hp, 64cc chambers, 72' or 90' center intake manifold bolt angles 14101081...87-95...305 14101083...87-up...350..........Gen.I, also used on crate motors, 285 or 300 hp, 64cc chambers, 72' center manifold bolt angles 14101128...86-87...350..........Aluminum, 58cc, angle plug 14102187...87-91...305..........1.84"/1.5" valves 14102191...87-up...350 14102193...87-up...305/350......1.94"/1.5" valves 22542525........................Dart/Olds/Chevy aluminum, 14'or 17' race head. 24502559...96-97................Bowtie, "SB2", 1st version, "mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber 25500141........................Buick/Chevy aluminum, 10' race head, 42cc chambers, symmetrical ports, 235cc intake port volumes, 2.1"/1.625" valves 25534351C..04-up................Gen.I Bowtie, cast iron Vortec head, 175/65cc ports, 2.00/1.55 valves, "small port head" 25534371C..04-up................Gen.I Bowtie, cast iron Vortec head, 206/77cc ports, 2.00/1.55 valves, "large port head" 33417369...90-up...350..........Gen.I Goodwrench crate motor,"Hecho en Mexico", 76cc World Products Cast Iron Heads ( by part numbers ) 4351 67cc, 162cc intake port 4350 76cc, 162cc intake port 4205 58cc, 162cc intake port, 305 torquer 4256 67cc, 172cc intake port, torquer 4257 76cc, 172cc intake port, torquer Trick Flow Twisted Wedge Alm ( by part number ) 31400001 64cc, 2.02-1.6, screw in studs, guide plates,185cc intake ports, candid valve angles 31400002 same 01, except with 72º intake bolts for 87-up 31400003 same 01, except with center valve cover bolt, 86- up 31400005 same 01, except 1.440 valve springs 31400006 same 01, except, with 72º intake bolts, old style valve covers Edelbrock Alm. Heads 6061 Performer RPM Bare head, angle plug, 70cc 6063 Performer RPM Bare head, straight plugs, 70cc 6071 Performer RPM Same as 6061 exc. complete 6073 Performer RPM 70cc, 170cc intake port, straight plug, complete 6075 Performer 65-up, 70cc, 2.02-1.6, screw in studs, guide plates, heat riser 6085 Performer 87-93, center bolt valve cover, 60cc 6087 Performer 87, center bolt valve cover, 60cc, 165cc intake port 7700 Vr. Jr. Race Heads, Bare, 71cc, 212-267cc port, CNC Machined, 2.08-1.6, 7720 Same as 7700 exc complete Big Blocks 058 241/86 cc port 063 256/114 cc port 083 243/110cc port 215 256/114cc port 241 252/116cc port 280 256/114cc port 290 256/114cc port 290 262/115cc port small plug head 291 327/120cc port 340 320/120cc port 820 255/114cc port 840 326/120cc port 842 318/112cc port 990 323/127cc port 330864 396-454 70-81 Oval Port 330865 366-427 70-76 Truck HD Oval Port 336781 454 73-85 Oval Port 343771 366-454 68-85 Truck HD 343772 366-454 76-84 Truck HD Oval Port 346236 454 75-76 Oval Port 353049 400-402 70-76 Oval Port 473328 366 68-85 Truck HD Oval Port 3732791 348 58 3758379 348 59-61 3759256 348 58 3767738 348 59-61 3781147 348 60-61 Hi Perf 3795586 409 61 360HP 3814690 409 62-64 Hi Perf 3819333 348-409 62-65 Truck 3830817 409 63-65 340 HP 3837731 409 63 RPO Z11 3852583 409 65 400 HP 3856206 396 65 Oval Port 3856208 396 65 Corvette 425 HP Sq. Port 3856213 366 66-82 Oval Port 3856260 396 68 3872702 396-427 66 Oval Port 3873858 396, 427 66 Sq. Port 3876875 427 77-85 Truck Oval Port 3904390 396-427 67 Oval Port 3904391 396-427 67 Sq. Port 3904392 427 67 Sq. Port Almuminum L-88 & L-89 3904393 366 66-68 Truck Oval Port 3909802 396-427 67 Oval Port 3917215 396-427 68 Oval Port 3917219 366-427 68-85 Truck HD Oval Port 3919840 396-427 67-69 Sq. Port 3919842 396-427 68-69 L-88 & L-89 Alm 3931063 396-427 68-72 Oval Port 3933148 366-427 68-84 3933149 427 68-76 Truck 3946074 454 69-71 Alm. L-88, ZL-1, LS-6 3964290 400-454 70 Oval Port 3964291 402-454 70 Sq. Port L-78, LS-6 3965198 396 68-69 Oval Port 3975950 366-427 68-70 Truck Oval Port 3986133 366-427 68-85 Truck Oval Port 3986136 366-427 68-84 Truck Oval Port 3993820 400-454 71-72 Oval Port 3994026 454 71 LS-6 Sq. port 3999241 402-454 72 Oval Port 6272292 402-454 70-75 Oval Port 14092359 427 86-88 Truck Oval Port 14092360 454 85-88 Truck Oval Port |
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Castings and Codes
330545.....73......350..........76cc, 2.02/1.60
333881.....74-75...350..........76cc, 2.02/1.60
333882.....74-80...350/400......76cc
340292.....70's.......Over the counter, angle plug, 64cc
354434.....75-79...262/267/305
358741.....76-79...305
376450.....75-81...262/267/305..7 exhaust bolt holes
376455.....77-85...350
462624.....75-86...350/400
468642.....76-up...350/400
471513.....79......267/350
517513.....79......267/350
1816887....63......283..........Made in "Canada", GMC HD truck
3636839....55......265
3703523....55......265
3713358....55-56...265
3713569....55-56...265
3725306....56......265
3731539....57......283..........1x4 & FI
3731544....57-61...283
3731554....57-62...283
3731556....57......283..........Truck, Made in Canada
3731762....56......265..........Vette, 2x4 carbs
3737775....62-67...283/327
3740997....57......283..........2x4 & FI
3743056....58......283
3743096....62-67...327..........GMC Truck
3747363....57-61...283
3747460....59-67...283/327
3748770....58......283
3748772....58-61...283
3755537....57-62...283
3755539....58-62...283
3755549....57-62...283
3755550....59......283
3755585....62-67...327..........GMC Truck
3767462....62-67...327
3767465....59-61...283
3767754....59-61...283
3767792....60-64...283
3770126....69......327
3774682....60-64...283/327
3774684....62-64...327
3774692....58-64...283
3782461....64-66...327..........camel hump, no accessory holes,
160/62cc port volumes
3782461X...60-63...283/327......camel hump, no accessory holes,
slightly larger 172/64cc port volumes
3795896....63-65...283
3795896....62-64...327
3798996....63-67...327
3814480....60-67...283/327
3814482....62-67...283/327/350..75cc chambers
3817680....63-67...283/327
3817681....62-67...327
3817682....61-62...283
3836839....55......265
3836842....57-67...283/327
3837064....56-62...265/283
3837065....55-56...265..........Truck
3848720....57-58...283
3876775....60-67...283/327
3884520....66-67...283..........Some marked "Made in Canada",
60cc chamber, also used by Studebaker
3890462....66-67...302/327/350..Camel hump, no accessory holes
3901068....87-up...350..........Crate motor, 285hp, 64cc chamber
3911032....68......307/327
3912264....58-62...283
3912265....63-64...283
3912311....65-67...327
3912313....65-67...327
3917290....67-68...307/327
3917291....67-68...302/327/350..Camel hump, no accessory holes
3917292....68......327/350......Camel hump
3917293....68......307/327......75cc chambers
3927185....69-70...307/327......70cc chambers
3927186....69-70...302/350......Camel hump, 64cc chambers, accessory holes
3927187....69-70...350..........Camel hump, 64cc chambers, accessory holes
3927188....69......327..........74cc chambers
3927188....70......307..........74cc chambers
3931633....68-73...307
3931635....68-76...350
3931638....68......327..........Truck
3932441....69-70...350..........76cc chambers
3932441X...69-70...350/400......80cc chambers
3932454....69-73...307
3932454....69-79...350..........Truck
3946812....69......350
3946813....69-70...350
3947040....68......327..........Right angle casting identifier
64cc chambers, good HP head
used in trucks, no accessory holes
3947041....69-70...302/350......Right angle casting identifier,
64cc, accessory holes, good HP head
3951598....70......400..........76cc chambers
3964286............350
3965742....70......350..........over the counter, angle plug
3970126....67-70...327/350
3973370....69-70...350..........over the counter, straight or angle plug
3973414....70......350..........LT1-370hp, Camel hump, 64cc
3973487....71-72...350..........used on 71-72 350 LT1, 75cc
3973487X...71-72...350..........75cc
3973493....71......400..........76cc
3986316....71......350..........76cc
3986336X...........350..........76cc
3986388....68-76...307/350
3986339....71......307/350......74cc
3986339X...71......307/350......74cc
3991492....70......350..........LT1, Camel hump, accessory holes
64cc, straight plugs
3991492....70-up................over the counter, Camel hump,
64cc, straight or angle plugs
3998916....72......350..........also used w/'72 350 LT1,
big valves, screw in studs
3998920....72-73...350
3998991....72-73...307/350......75cc
3998993....72-73...307/350......75cc
3998993....current..350.........Goodwrench crate motors,
"Hecho en Mexico"
3998997....72-73...350/400......76cc
3998997....78-84...305/350......76cc
4079261....75......350
10033867........................Over the counter Pontiac 23' head
62cc, angle plug, 196cc intake
port, aluminum
10045434........................Over the counter Pontiac 15' head
55cc, angle plug, raised runner
aluminum, "roll over" head
10051101........................Bowtie, aluminum, 55cc, angle plug
raised runner, 196cc intake port
10088113...88-up...350..........Aluminum, 58cc, angle plug, raised
"D" port exhaust, 1.94"/1.5" valves
10093328........................Over the counter, Pontiac 15' head
aluminum,224cc ports, 61cc chambers,
"roll over" head
10106178...90......350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10106179...90......350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10110810...93-up...350..........Gen. 1
10125320...94-96...350..........Gen.II LT1, cast iron version, used
on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster
reverse flow cooling
10128374...92-up...350..........Gen.II LT1, 53cc, angle plug,
aluminum, reverse flow cooling,
175/68cc ports
10134352........................Bowtie, 45cc, angle plug, "low"
port, 223cc intake port, aluminum,
18' race head
10134363........................NOTE: This casting # has been used
in many different versions of this
aluminum 18' and 15' Bowtie race head.
Different chamber volumes, port
volumes, port locations, valve sizes,
etc. were used. Check this casting
carefully to determine which features
it may have. There are at least 5
different versions as of 7/98.
10147898...95-96...350..........Gen.I crate motor
10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10185040........................Bowtie, aluminum, 45cc chambers,
1st version, symmetrical ports,
263cc intake ports, splayed valves
10185040........................Bowtie, aluminum, 45cc chambers,
2nd version, symmetrical ports,
240cc intake ports, splayed valves
10205245...93......350..........Gen.II LT1, aluminum, reverse
flow cooling, 175/68cc port volumes
10207643...94-96...350..........Gen.II LT1, aluminum, reverse
flow cooling, 175/68cc port volumes
10215339...97......350..........Gen.III, "LS1", aluminum
10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10225122...95......350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10239902...96-up...350..........Gen.II LT4, aluminum, reverse
flow cooling, 195cc port, 54.4cc chamber, angle plug
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves
12480011...97-up................Bowtie "SB2.2", aluminum, 2nd
version of "SB2", 48cc chambers,
"mirror ports", revised valve
angles & plug location
12551561...96......350..........Gen.II, "LT1", aluminum
12552520...97-up...305..........Vortec, truck
12554290...94-96...350..........Gen.II, "LT1", cast iron version, used
on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster
reverse flow cooling
12555690...96......350..........Gen.II, "LT4", aluminum
12558062...98......350..........Vortec, truck
12558806...97-98...350..........Gen.III, "LS1", aluminum
12559853...99......350..........Gen.III, "LS1", aluminum
14094093...86-88...350
14010201...84......305
14011034........................Bowtie, cast iron, 64cc chambers,
184cc port volume, angle plug,
"Phase II" head
14011049........................Bowtie, aluminum, 55cc chambers,
angle plug, 180cc ports, "Phase 6"
14011083...55-86...350..........Crate motor for years indicated.
300hp, 64cc chambers
14014415...80-85...267/305
14014416...80-85...305..........HO, 58cc chambers, 1.84"/1.5" valves
14014440...80......305..........58cc chambers, 1.84"/1.5" valves
14020517...80......350
14020555...81......305
14020556...81......350
14022056...85......350
14022601...80-85...267/305......58cc chambers, 1.84"/1.5" valves
14022801...80-85...305
14071114...80-85...350
14079261...86......350
14085963...86......350
14089119...86-88...350
14094093...86-88...350
14096217...55-86...350..........Crate motor, 285hp/300hp, 64cc chambers,
72' or 90' center intake manifold bolt angles
14100181...87-91...305
14101083...87-up...350..........Crate motor, 285 or 300 hp, 64cc
chambers, 72' center manifold bolt
angles
14101128...86-87...350..........Aluminum, 58cc, angle plug
14102187...87-91...305..........HO, 58cc chambers, 1.84"/1.5" valves
14102191...87-up...305/350
14102193...87-up...305/350
24502559...96-97................Bowtie, "SB2", 1st version,
"mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber
25500141........................Buick/Chevy aluminum 10' head,
42cc chambers, symmetrical ports,
235cc intake port volumes,
2.1"/1.625" valves
33417369...90-up...350..........Gen.I Goodwrench crate motor,
"Hecho en Mexico", 76cc
348-409 HEADS
3732791.....348......58-60
3758379.....348......59-60...250 hp
3759256.....348......58
3759332.....348......58-60
3767738.....348......59-60...250 hp
3781147.....348......60-61...HiPerf, 2.06"/1.72" valves
3795586.....348/409..61......HiPerf, 2.06"/1.72" valves
3814690.....409......62-63...HiPerf, 2.19"/1.72" valves
3819333.....348/409..62-65...HD Truck
3830817.....409......63-65...340 hp
3837731.....427......63......"Z11" (4.312" bore x 3.65" stroke)
3852583.....409......63-65...HiPerf, 2.19"/1.72" valves
348-409 BLOCKS
3732755.....348......59-61
3732811.....348......58
3751872.....348......58
3755011.....348......59-61
3771705.....348......59-61
3782012.....348......58-61
3788068.....409......62-63
3795623.....409......61
3798962.....348......62-65...Truck
3815707.....348......58-61
3830814.....427......63......"Z11" (4.312" bore x 3.65" stroke)
3830814.....409......63-64
3839752.....409......62-63
3839754.....409......65
3844422.....409......64-65
3857655.....348......62-65...Truck
3857656.....409......64-65
3860386.....409......62-64
3860387.....348......58
340220.....427T......68-85
345014.....454.......70-76
359070.....454.......70-76
361959.....454.......73-90
364776.....427T......68-85
364779.....366T......68-90
399204.....509.......70-71 Alum., CanAm, 4.5" bores, Cylinder liners
399289.....454.......73-79
399293.....366T......77-78
473478.....427T......77-90
3824553....366T......66-67
3855961....396.......65-66
3855961....427.......66
3855962....396.......65-66
3855977....366T......66-73
3869942....427.......66-67
3902406....396.......67
3904351....427.......67
3904354....366T......66-76
3916319....366T......68
3916321....427.......68
3916323....396.......68
3925521....366T......68-85
3935439....427.......68-69
3935440....396.......68-69
3937724....366T......68-85
3937726....427T......68-84
3946052....427.......69 Alum. ZL-1
3946053....427.......97 Alum. ZL-1, 2nd version
3955270....427.......69
3955272....396.......69
3955274....366T......68-85
3955276....427T......68-73
3963512....427.......69
3963512....454.......70-76
3969854....402.......69-72
3969858....427T......68-84
3999289....454.......72-79
3999290....396.......68-69 Truck
3999290....402.......70-72 Truck
3999290....402.......72 Passenger
3999293....366T......68-90
3999294....427T......68-84
10051107...454.............Bowtie, MkIV, Short deck, CNC prep, 4.25" bore
10068286...454.......90
10114182...454.......91-up, Gen.V
10114183...366T......91-up, Gen.V
10114184...427T......91-up, Gen.V
10134366...454T.............Bowtie, Gen.V, Tall deck
10185050...454.............Bowtie, Gen.V, Short deck
10237297...454.......96-up, "Vortec 7400", "L-29"
10237300...502.......96-up, Gen.VI, 4.466" bore
12550313...454.......91-up, Gen. V crate motor
14015445...454.......78-90
14044807...454T............Bowtie, MkIV, Tall deck, 4.25" bore
14096859...502.............Gen.V, HO
24502504...454.............Bowtie, Gen.V, Race prep
24502506...454T............Bowtie, Gen.V, Race prep
24502572...................4.5" bore Olds DRCE 2,
9.5" deck height
BBC HEADS
330864.....68-84...oval...OPEN...396, 402, 366T,
427T, 454 Truck
330865.....68-84...oval...OPEN...396, 402, 366T,
427T, 454 Truck
330866.....68-78...oval...OPEN...366T, 427T
330867.....68-73...oval...OPEN...427T
336765.....68-78...oval...OPEN...427T
336768.....73-76...oval...OPEN...427T
336781.....73-85...oval...OPEN...454
343771.....68-86...oval...OPEN...366T, 427T, 454
343772.....68-86...oval...OPEN...366T, 427T, 454
343783.....70-76...oval...OPEN...454 Truck
346236.....75-87...oval...OPEN...454
352625.....70-76...oval...OPEN...454 Truck
353049.....73-84...oval...OPEN...454
366765.....74-78...oval...OPEN...427T
386781.....73-79...oval...OPEN...454
473328.....68-69...oval...OPEN...366T
3856206....65-66...oval..CLOSED..396
3856208....65......rect..CLOSED..396/425hp
396/375hp "Z-16" Chevelle
3856213....66-82...oval..CLOSED..366T, 427T
3856260....68......oval..CLOSED..396 Truck
3872702....65-66...oval..CLOSED..396, 427
3873858....65-67...rect..CLOSED..396, 427
3876875....77-85...oval...OPEN...427T
3904390....67......oval..CLOSED..396, 427
3904391....67......rect..CLOSED..396, 427
3904392....67......rect..CLOSED..427 Aluminum, L88, L89
3904393....68-76...oval...OPEN...366T
3909802....67......oval..CLOSED..396, 427
3917215....67-68...oval..CLOSED..396, 427
3917219....68-85...oval...OPEN...366T, 427T
3919840....67-69...rect..CLOSED..396, 427
3919842....68-69...rect..CLOSED..396, 427, Aluminum L88, L89
3931063....68-69...oval..CLOSED..396, 402, 427
3933148....69-84...oval...OPEN...'69 396/265hp, 366T, 427T
3933149....68-76...oval...OPEN...427T
3935401....68-76...oval...OPEN...427T
3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum
'71 454 LS6, "round exhaust port"
3964290....69-70...oval..CLOSED..396, 402, 427, 454
Large or small hex spark
plugs used
3964291....69-70...rect..CLOSED..396, 402, 427, 454
Large or small hex spark
plugs used
3965198....68-69...oval..CLOSED..396 Truck
3975950....68-70...oval...OPEN...396, 402 Truck, 366T, 427T
3986133....68-85...oval...OPEN...366T, 427T, 454 Truck
3986135....69-73...oval...OPEN...366T, 427T
3986136....68-84...oval...OPEN...366T, 427T, 454 Truck
3993820....71-84...oval...OPEN...402
3993820....71-84...oval...OPEN...454 Truck
3994026....71......rect...OPEN...454 LS6
3999241....72......oval...OPEN...402, 454
6272292....70-78...oval...OPEN...402, 454
6272990....70-78...rect...OPEN...454 service replacement
10045427...........rect..........Pontiac/Chevy Aluminum
Large Port, race
10049875...........rect..........Pontiac/Chevy Aluminum
Small port, race
10051128...........rect..........Bowtie, Aluminum 68cc chambers
Symmetrical ports
10051129...........rect..........Bowtie, Aluminum "raw"
casting, Symmetrical ports
10101140...91-up...oval..CLOSED..Gen.V 366T, 427T
10114156...94-up...oval...OPEN...Gen.V & VI 454
10141279...96-up...oval..CLOSED.."Vortec 7400", 100cc chambers
10487052...77-90...oval...OPEN...366T
12363391...96-up...oval...OPEN...Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
12363401...96-up...rect...OPEN...Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
12363425...96-up...rect..........Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
"raised runners", 2nd design "861"
12363861...84-96...rect..........Bowtie, Aluminum, MkIV,
"raised runners", 1st design
12363861...96-up...rect..........Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
"raised runners", 2nd design
12363862...84-96...rect..........Bowtie, Aluminum, MkIV
"raw" casting of "861" MKIV
1st design
14011077...69-up...rect...OPEN...Aluminum, fits MKIV, "C-port"
also sold as a "solid" head
14081045...78-87...oval...OPEN...454
14081052...85-87...oval...OPEN...366T, 427T, 454 Truck, Marked "HiPerf"
14092359...86-90...oval...OPEN...366T, 427T, Marked "HiPerf"
14092360...86-88...oval...OPEN...454 Truck
14096188...70-71...rect...OPEN...454 service replacement
14097088...91-up...rect...OPEN...Gen.V 454/502 HO
24502585...97......rect..........Olds/Chevy, DRCE 2,
Pro Stock aluminum
T = Tall deck
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