Small Block Chevy Block casting numbers

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...2
366286...................4...Bowtie, Aluminum, siamesed,
                             straight nodular iron main 
                             caps, 2-piece seal, 4.00-4.150"
                             bores, 2.45" main journals
366287...................4...Bowtie, Aluminum, siamesed,
                             straight nodular iron main 
                             caps, 2-piece seal, 4.00-4.150"
                             bores, 2.45" main journals
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
3814660....327...68-69...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....327.....68....2...Truck
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....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 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...70-73...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"
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
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
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
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
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...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...87-91...2...Roller 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...87-90...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

 

Big Block Chevy Block casting numbers

CASTING#.....SIZE...YEAR...MAIN CAP BOLTS....NOTES


340220.....427T......68-85...4-bolt
345014.....454.......70-86...
346236.....454.......75-76...2-bolt
359070.....454.......70-90...
361959.....454.......73-90...2 or 4 bolt
364776.....427T......68-85...4-bolt
364779.....366T......68-90...4-bolt
399204.....509.......70-71...4-bolt, Alum., CanAm, 4.5" bores, Cylinder liners
399289.....454.......73-79
399293.....366T......77-78...4-bolt
473478.....427T......77-90...4-bolt
3782870....427T......68-76...4-bolt
3824553....366T......66-67...4-bolt
3855961....396.......65-66...2 or 4 bolt
3855961....427.......66......2-bolt
3855962....396.......65-66...4-bolt
3855977....366T......66-73...4-bolt
3869942....427.......66-67...2 or 4 bolt
3902406....396.......67......2 or 4 bolt
3904351....427.......67......2 or 4 bolt
3904354....366T......66-76...4-bolt
3916319....366T......68......4-bolt
3916321....427.......68......2 or 4 bolt
3916323....396.......68......2 or 4 bolt
3925521....427T......68-85...4-bolt
3935439....427.......68-69...2 or 4 bolt
3935440....396.......68-69...2 or 4 bolt
3937724....366T......68-85...4-bolt
3937726....427T......68-84...4-bolt
3946052....427.......69......4-bolt, Alum. ZL-1, Mark IV
3946053....427.......97......4-bolt, Alum. ZL-1, 2nd version, Mark IV
3955270....427.......69......2 or 4 bolt
3955272....396.......69......2 or 4 bolt
3955274....366T......68-85...4-bolt
3955276....427T......68-73...4-bolt
3963512....427.......69......2 or 4 bolt
3963512....454.......70-76...2 or 4 bolt
3969852....366T......68-84...4-bolt
3969854....396.......69......2 or 4 bolt
3969854....402.......70-72...2 or 4 bolt
3969858....427T......68-84...4-bolt
3999289....454.......72-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps
3999290....396.......68-69...2 or 4 bolt, Truck
3999290....402.......70-72...2 or 4 bolt, Truck
3999290....402.......72......2 or 4 bolt, Passenger
3999293....366T......68-90...4-bolt
3999294....427T......68-84...4-bolt
10051107...454...............4-bolt, Bowtie, MkIV, Short deck, CNC prep, 4.25" or 4.495" bores
10068286...454.......90-91...4-bolt, Mark IV, Short deck
10069284...427T..............4-bolt, Mark IV, Tall deck
10114182...454.......91-up...4-bolt, Gen.V
10114183...366T......91-up...4-bolt, Gen.V
10114184...427T......91-up...4-bolt, Gen.V
10134366...454T..............4-bolt, Bowtie, Gen.V, Tall deck
10185050...454...............4-bolt, Bowtie, Gen.V, Short deck
10237297...454.......96-up...4-bolt, Vortec 7400", "L-29"
10237300...502.......96-up...4-bolt, Gen.VI, 4.466" bore 
12550313...454.......91-up...4-bolt, Gen.V crate motor, Gen. VI 4.25" bare block, fuel pump boss
12556110...496.......01-up...4-bolt, Gen. VII 8.1L, Vortec 8100, Truck
14015443...454.......87-90...4-bolt, Mark IV, Truck, Motorhome
14015445...454.......78-90...2 or 4 bolt
14044807...454T..............4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores
14096859...502...............4-bolt, Gen.V, HO
24502504...454...............4-bolt, Bowtie, Gen.V, Race prep, 9.8 "short" deck height
24502506...454T..............4-bolt, Bowtie, Gen.V, Race prep, 10.2 "tall" deck height
24502572.....................4-bolt, 4.5" bore Olds DRCE 2,
                           9.5" deck height
T = Tall deck

 

Small Block Chevy head casting numbers


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
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....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, 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
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
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
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
12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc
12564243...02......350..........Gen.III, "LS6", aluminum
14008856...79-81...267
14094093...86-88...350
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......1.84"/1.5" valves, 58cc 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
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
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

 

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, 118cc chamber, 256/114cc ports
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, 120cc chamber, 225/116cc ports
352625.....70-76...oval...OPEN...454 Truck
353049.....73-84...oval...OPEN...454, 122cc chamber, 255/119cc ports
366765.....74-78...oval...OPEN...427T
473328.....68-69...oval...OPEN...366T
3856206....65-66...oval..CLOSED..396, 97cc chamber
3856208....65......rect..CLOSED..396/425hp, 109cc chamber 
                                 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, 98cc chamber
3873858....65-67...rect..CLOSED..396, 427, 109cc chamber
3876875....77-85...oval...OPEN...427T
3904390....67......oval..CLOSED..396, 427, 98cc chamber
3904391....67......rect..CLOSED..396, 427, 107cc chamber 
3904392....67......rect..CLOSED..427, Aluminum, L88, L89, 107cc chamber
3904393....68-76...oval...OPEN...366T
3908952....67......oval...OPEN...427, "M.Truck", Marine
3909802....67......oval..CLOSED..396, 427, 101cc chamber
3917215....67-68...oval..CLOSED..396, 427, 101cc chamber
3917219....68-85...oval...OPEN...366T, 427T
3919840....67-69...rect..CLOSED..396, 427, 107cc chamber
3919842....68-69...rect..CLOSED..396, 427, Aluminum L88, L89, 107cc chamber
3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber
3933148....69-84...oval...OPEN...'69 396/265hp, 366T, 427T, 112cc chamber
3933149....68-76...oval...OPEN...427T, 122cc chamber
3935401....68-76...oval...OPEN...427T
3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum, 118cc chamber
                                 '71 454 LS6, "round exhaust port"
3964290....69-70...oval..CLOSED..396, 402, 427, 454, 101cc chamber
                                 Large or small hex spark 
                                 plugs used
3964291....69-70...rect..CLOSED..396, 402, 427, 454, 109cc chamber
                                 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......oval...OPEN...402, 113cc chamber, 255/114 ports
3993820....71-84...oval...OPEN...454 Passenger and Trucks, 113cc chamber, 255/114 ports
3994026....71......rect...OPEN...454 LS6, 118cc chamber
3999241....72......oval...OPEN...402, 454, 113cc chamber

6272292....70-78...oval...OPEN...402, 454
6272990....70-up...rect...OPEN...454 service replacement, used on some MKIV crate engines

118cc chamber 10045427...........rect..........Pontiac/Chevy Aluminum, 91cc chamber                                  Large Port, race 10049875...........rect..........Pontiac/Chevy Aluminum                                  Small port, race 10051128...........rect..........Bowtie, Aluminum 72cc chambers                                  Symmetrical ports 10051129...........rect..........Bowtie, Aluminum "raw"                                  casting, Symmetrical ports 10052902...........oval...OPEN...MkIV, 427T 10101140...91-up...oval..CLOSED..Gen.V 366T, 427T 10114156...91-up...oval...OPEN...Gen.V & VI 454, 118cc chamber 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, 110cc chamber 12363401...96-up...rect...OPEN...Bowtie, Aluminum, Signature                                  Series, fits MKIV, Gen.V, Gen.VI, 118cc chamber 12560241...98-up...oval..CLOSED.."Vortec 7400", 100cc chambers 12562934...00-up...rect...OPEN...Gen. VI 502 Marine 14011077...69-up...rect...OPEN...Aluminum, fits MKIV, "C-port"                                  118cc chamber, also sold as a "solid" head 14044861...84-96...rect..........Bowtie, Aluminum, MkIV,                                   "raised runners", 1st design, 105cc chamber 14044861...96-up...rect..........Bowtie, Aluminum, Signature                                  Series, fits MKIV, Gen.V, Gen.VI                                  "raised runners", 2nd design, 115cc chamber 14044861...84-96...rect..........Bowtie, Aluminum, MkIV                                  "raw" casting of "861" MKIV                                  1st design 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, also used on later Mark IV LS-6, LS-7
and 454 HO crate motors, 116cc chamber 14097088...91-up...rect...OPEN...Gen.V 454/502 HO, 118cc chamber 24502585...97......rect..........Olds/Chevy, DRCE 2,                                  Pro Stock aluminum, for blocks w/4.900" bore centers T = Tall deck Oval includes both "peanut" (also called "round") ports and large oval ports

SBC Cylinder Heads

Here is a list of some GM production SBC cylinder heads, many of which some consider to be desirable high performance castings.  Included is some information on each casting.  SBC heads are commonly identified by the last 3 digits in the casting number.    All SBC heads should either have 6, 7, or 8 digits in the casting number, as an example you can have a "462" suffix head with different prefixes - example 3890462, 3891462, 3990462.  All castings that share the same suffix should have the same basic port configuration, an example of the differences that can be encountered might be in the valve sizing (1.94/1.50" or 2.02/1.60").
 

SMALL CHAMBER PRODUCTION "ON CAR" CYLINDER HEADS

"462" Could be 3890462, 3891462, 3990462.  The 462 is one of the best flowing production SBC heads.  They were used between 1962-1968 on various HP versions of 302, 327, or 350 engines.  They could have come with either 1.94/1.50" or 2.02/1.60" valves, had 64CC combustion chambers, DO NOT have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  These heads have double hump casting marks.

"461" Could be 3782461, or 3782461X.  These were an excellent performance head.  The regular 461 casting was used between 1964-1966 and could be found on 327 engines.  They had 2.02/1.60" valves, a 64CC combustion chamber, DO NOT have accessory holes, intake port volume of 161CC's, exhaust 62CC's.  These heads have double hump casting marks.  The "X" castings had the same port configuration, but had larger port volumes, they DO NOT have accessory holes.  The intake port on the "X" casting was 172CC's, and the exhaust port was 62CC's, valve sizing was 1.94/1.50".  The "X" heads had double hump casting marks as well.

"291" Could be 3912291, or 3917291.  This is another good performance casting.  They were found on 1967-1968 302, 327, or 350 engines.  They could have either 1.94/1.50" or 2.02/1.60" valves, 64CC combustion chambers, DO NOT have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  These heads have double hump casting marks.

"492" 3991492.  Another good performance head.  They were found on 1970 LT-1 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's.  These heads have double hump casting marks.  This particular casting head was also available as an "over the counter" head from GM in straight or angle plug configurations.

"186" 3927186.  Another good performance head.  They were found on 1969-1970 302 and 350 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  These heads have double hump casting marks.

"292" 3917292, or 340292.  Both are good performance heads.  The 3917292 was found on 1968 327 and 350 engines, had 1.94/1.50" valves, 64CC combustion chambers, straight plug configuration, not sure on the accessory holes, and I do not have any port volume data on these heads.  These heads have double hump casting marks.  The 340292 was available from GM "over the counter".  This version had angle plug configuration, 2.02/1.60" valves, 64CC combustion chambers.  These were known as the "Turbo" heads.

"041" 3947041, also 3947041X.  A good performance head.  They were found on 1969-1970 302 and 350 engines.  They had either 1.94/1.50" or 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, I don't have port volume data for the regular 041, the 041X intake port should be 165CC's, the 041X exhaust port should be 65CC's.  These heads have a single somewhat triangular shaped casting mark (slope on the upper left).

"040" 3947040.  A good performance head (I have read).  Supposedly these heads came on 1968 327 truck engines.  They had 1.94/1.50" valves, 64CC combustion chambers, DO NOT have accessory holes.  I do not have any port volume data for these castings.  These heads also had a single triangular shaped casting mark (slope on the upper left).

"187" 3927187.  Another good performance head (I think).  They were found on 1969-1970 350 engines.  I believe they had 1.94/1.50" valves, 64CC combustion chambers, DO have accessory holes.  I do not have any data on port volumes for this casting.  These heads have double hump casting marks.

"414" 3973414.  A good performance head.  They were found on 1970 350 LT-1 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes.  I do not have any port volume data for this casting.  These heads have double hump casting marks.
 

LARGE CHAMBER PRODUCTION "ON CAR" HEADS

"487" 3973487, OR 3973487X.  The regular casting was found on the 1971-1972 350 LT-1 engines, had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  The 487X had 2.02/1.60" valves.

"441" 3932441.  This head was found on the 1969-1970 350 engines (255hp 350), it was a decent flowing large chamber head.  It had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 61CC's.  Not to be confused with 3923441, which was a 1.72/1.50" valve, 327 truck head.

"624" 462624, 426624, or 458624.  The 458624 was a truck head, with 1.72/1.50 valves non performance.  The other castings were used mid 70's and up on 350 engines, they came with 1.94/1.50" or 2.02/1.60" valves, had 76CC combustion chambers, DO have accessory holes, intake port volume is 161CC's, exhaust port volume is 62CC's.  These heads are made of thinner castings and are prone to cracking.

"882" 333882.  These heads were found on early-late 70's 350 and 400 engines.  They had 76CC combustion chambers, 1.94/13.50" valves, DO have accessory holes, intake port volume is 160CC's, exhaust port volume is 60CC's.  These heads are made of thinner castings and are prone to cracking as well.  The exhaust port on these heads is rather weak in my humble opinion, and is not considered to be a good performance head.  I have read some flow numbers on the internet regarding the 882's, and I have a hard time believing some of the flow numbers people are posting on these particular castings.  I did extensive flow testing on several of these particular castings, and was not very impressed with their flow characteristics.  The 441 or 487 are a much better large chamber head (in my humble opinion).  The 882 intake port is very close to that of the 624, the exhaust side is where the 882 is weaker.
 

OVER THE COUNTER GM IRON HEADS

"492" 3991492.  Another good performance head.  They were found on 1970 LT-1 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's.  These heads have double hump casting marks.  This particular casting head was also available as an "over the counter" head from GM in straight or angle plug configurations.

"3973370" A good over the counter head.  They had 64CC combustion chambers, supposedly straight or angle plug configuration.  I used a set of these on all 3 of my 383 strokers, they originally came with 1.94/1.50" valves.  We did some major port massaging and installed 2.02/1.60" valves, they responded very well to the modifications and worked very well.  The combustion chambers were 64CC's.  These were a decent iron head, with a lot of potential for performance.

"3965742" Another over the counter GM iron head.  I have no data on these particular castings, other than they were angle plug configuration.
 

 

Ford 429-460 cylinder heads

All of the 385 series castings like other Ford engines suffer from a very poor intake/exhaust flow ratio due to the fact that shock towers in the passenger car line up necessitated tucking the exhaust manifolds as close as possible to the engine for proper clearance.

C8VE-A First year of 385 series engine.
-75 to 77cc combustion chambers.
-Smog air boss and passages not drilled for 49 states emissions.
-Smog air boss is slightly smaller than on newer castings.
-Used positive stop shouldered rocker studs and cast iron rail self aligning rocker arms 1.73 to 1 ratio
-Valve sizes are 2.09" intake and 1.65" exhaust.


C9VE-A Basically the same as the '68 unit. Used beginning with the '69 model year vehicles includes engineering revisions to the '68 casting.

D0VE-C Again a revision of the original casting. Used beginning with the '70 model year through the end of the '71 model year. Slightly larger smog air boss.  All 3 being used for passenger cars D0VE-A is a less revised version and very similar to the D0VE-C's

D00E-R Cobra Jet and Super Cobra Jet castings.
-71 to 75 cc Combustion chamber volume
-Cobra Jet engines built before 11-'69 had adjustable valve train non adjustable after that date.
-All castings came with pushrod guide plates, sled fulcrums and stamped steel 1.73 to 1 rocker arms
-Adjustable valvetrain used non shouldered rocker studs, Non adjustable valvetrain used positive stop shouldered stud with 3/8" fine pitch threads on top
-All Super Cobra-Jet engines used a solid lifter camshaft and adjustable valve train.
-Valve sizes are 2.24" intake and 1.72" exhaust.
-Intake ports are larger at 2.51" x 2.11" ovals
-Exhaust ports are also larger at2.25" x 1.30" rectangular oval port shape

D2OE-AA,D2OE-AB and D3AE-FA '72 to '74 Police interceptor cylinder head.
-very similar to the Cobra Jet castings with non adjustable valvetrain.
-2.20" x 1.93" intake and 2.06" x 1.31" exhaust port sizes
-Valves are 2.19" intake and 1.72" exhaust
-87 to 90 cc combustion chambers


D2VE-A2A
-same port sizes and shape as other passenger car castings, basically a revised D0VE-C casting with pedestal rocker arm bosses.
-only year of the 87 to 90cc large round OPEN combustion chamber design, prone to detonation due to the lack of a quench pad
-not a good choice for high performance use
-Valve sizes are 2.09" intake and 1.65" exhaust.

D3VE-AA,A2A casting completely reengineered
-better chamber shape was back but at 90+ cc's.
-valve seat depth .100" deeper compared to the '72 and older castings.
-valves are .100" shorter
-pedestal rocker arm bosses and use stamped steel 1.73 to 1 ratio rocker arms.