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Chevy Small Block Casting Numbers (page 1)
CASTING#.....SIZE...YEAR...MAIN CAP BOLTS....NOTES
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 366298...................4...Bowtie, Aluminum, billet main caps, 3.398" bore with sleeves, two piece rear main seal. 366299...................4...Bowtie, Aluminum, nodular iron splayed caps, wet sump, 4.00" bore 389257.....302.....67....2 393288.....283...65-67...2 460703.....350.....78....4 460776.....305...78-79...2 460777.....305...78-79...2 460778.....305...78-79...2 or 4, some Canadian assembled heavy duty truck blocks have 4-bolt main caps 471511.....267...79-82...2 3556519....283...58-61...2 3703524....265.....55....2...No oil filter 3720991....265...56-57...2 3731548....265...57......2...No side motor mounts 3731548....283...57......2...No side motor mounts 3737739....283...58-64...2 3756519....283...58-62...2 3782870....327...62-67...2 3789817....283...62-64...2 3789817....327...62-67...2 3789935....283...61-64...2 3790721....283...62-64...2...Chevy II recessed oil filter boss 3790721....327...65-66...2...Chevy II recessed oil filter boss 3791362....327...62-67...2...Chevy II recessed oil filter boss 3792563....327.....65....2 3792582....283...64-65...2 3794226....283...58-63...2 3794460....327...62-64...2 3830944....327.....63....2 3834810....283...64-66...2 3834812....283...62-63...2 3837739....283...58-62...2 3849852....283...57-66...2 3849935....283...65-67...2 3858174....327...64-67...2 3858180....327...64-67...2 3858618....350...68-76...2 3862194....283...65-67...2...Chevy II recessed oil filter boss 3862812....283...62-64...2 3892657....302.....67....2...Z-28 Camaro 3892657....327.....67....2 3892657....350.....67....2...Camaro 3896944....283...66-67...2 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....2 or 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 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...Chevy/Olds Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump, 2-piece rear seal, 9.025" deck 22551660.................4...Chevy/Olds Rocket block, 4.00"-4.190" bores, 400 mains journal sizes, splayed steel caps, wet sump, raised cam 2-piece rear seal, 9.300" deck
Chevy Small Block Head Casting Numbers (page 1)
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..........LT1-350/370hp, Camel hump, 64cc chamber 3973487....71-72...350..........1.94/1.5 or 2.02/1.6 valves, was also used on '71 350/330hp LT1, 75cc chamber 3973487X...71-72...350..........1.94/1.5 or 2.02/1.6 valves, 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..........Crate motor, 285hp/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
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