• Gjut nr


    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, nodulariron 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


    CASTING#....YEAR....ENGINE SIZE....NOTES

    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

    SBC TWO PIECE REAR MAIN OIL SEALS

    CASTING#.....ENGINE SIZE.....NOTES

    1130.......327.......forged..medium journal...3.25" stroke
    1178.......302.......forged..medium journal...3.00" stroke
    1181.......305,350...cast....medium journal...3.48" stroke
    1182.......350.......forged..medium journal...3.48" stroke
    2680.......327.......forged..small journal....3.25" stroke
    2690.......350.......forged..medium journal...3.48" stroke
    3279.......302.......forged..medium journal...3.00" stroke
    3474.......283.......forged..small journal....3.00" stroke, military tank use
    4577.......327.......forged..small journal....3.25" stroke
    4672.......327.......forged..medium journal...3.25" stroke
    310514.....350.......cast....medium journal...3.48" stroke
    330550.....350.......cast....medium journal...3.48" stroke
    354431.....262.......cast....medium journal...3.10" stroke
    3727449....283.......forged..small journal....3.00" stroke
    3729449....265.......forged..small journal....3.00" stroke
    3734627....327.......forged..small journal....3.25" stroke
    3735236....265,283...forged..small journal....3.00" stroke
    3735263....283.......forged..small journal....3.00" stroke
    3782680....327.......forged..small journal....3.25" stroke
    3814671....327.......forged..small journal....3.25" stroke
    3815822..265,283,302.forged..small journal....3.00" stroke
    3835236....283.......forged..small journal....3.00" stroke
    3836266....283.......forged..small journal....3.00" stroke
    3848847....283.forged or cast..sm. journal....3.00" stroke
    3849847....283.......forged..small journal....3.00" stroke
    3876764....283.forged or cast..sm. journal....3.00" stroke
    3876768....283.......forged..small journal....3.00" stroke
    3884577....327.......forged..small journal....3.25" stroke
    3892690....350.......forged..medium journal...3.48" stroke
    3911001....307,327...cast....medium journal...3.25" stroke
    3911011....307,327...cast....medium journal...3.25" stroke
    3914672....327.......forged..medium journal...3.25" stroke
    3923279....302.......forged..medium journal...3.00" stroke
    3932442..267,305,350..cast...medium journal...3.48" stroke
    3941174....307,327...cast....medium journal...3.25" stroke
    3941178....302.......forged..medium journal...3.00" stroke
    3941182....350.......forged..medium journal...3.48" stroke
    3941188....350.......forged..medium journal...3.48" stroke
    3949847....283..forged or cast..sm. journal...3.00" stroke
    3951130....327.......forged..medium journal...3.25" stroke
    3951529....400.......cast....large journal....3.75" stroke

    SBC ONE PIECE REAR MAIN OIL SEAL

    10168568...265.......cast....medium journal...3.00" stroke
    12552215...364.......cast....medium journal...3.62" stroke, Gen. III, 6.0L
    12552216...325,350,364.......cast....medium journal...3.62" stroke, Gen. III 5.7L LS1, 5.3L, 6.0L
    12553312...293.......cast....medium journal, 3.27" stroke, Gen. III, 4.8L
    12553482...293.......cast....medium journal, 3.27" stroke, Gen. III, 4.8L
    14088526...305,350...cast....medium journal...3.48" stroke
    14088532...350.......forged..medium journal...3.48" stroke
    14088535...305,350...cast....medium journal...3.48" stroke
    14088552...350.......forged..medium journal...3.48" stroke

    ZR1, "LT5", 350 DOHC
    10106122...350.......forged..large 2.76" journal...3.66" stroke

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

    0-326711.....................4-bolt, Alum., CanAm, 4.44" bores, steel cylinder liners
    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, steel Cylinder liners
    399293.....366T......77-78...4-bolt
    473478.....427T......77-90...4-bolt
    495102.......................4-bolt, Alum., CanAm, 4.5" bores
    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-up...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.......71-79...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, 9.8" deck, siamesed bores, 4.25" semi-finished bores, can be bored to 4.50"
    10069282...366T......90-91...4-bolt, Mark IV, Tall deck
    10069284...427T..............4-bolt, Mark IV, Tall deck
    10069286...454.......90-91...4-bolt, Mark IV, Short 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" Gen.VI
    10237299...427T......96-up...4-bolt, Gen.VI, 7.0L, truck
    10237300...502.......96-up...4-bolt, Gen.VI, 4.466" bore
    12550312...427T......96-up...4-bolt, Gen.VI, 4.250" bore, fuel pump boss, clutch linkage pivot boss
    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
    12561357...454.......96-up...4-bolt, Gen.VI
    12561358...502...............4-bolt, Gen. VI
    14015443...454.......87-90...2 or 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
    25534402.....................4-bolt, 4.590" bore Olds DRCE 3, 9.25" deck height



    T = Tall deck, 10.2" deck height


    1991 and later Gen.V, VI and VII production BBC motors have one-piece rear main crank seals.

    CASTING#....YEAR....NOTES

    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....69-72...rect..CLOSED..396, 402, 427, 454, 109cc chamber, Large or small hex spark plugs used, cratemotor usage in years after 1970.
    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, SignatureSeries, fits MKIV, Gen.V, Gen.VI, 110cc chamber
    12363401...96-up...rect...OPEN...Bowtie, Aluminum, SignatureSeries, fits MKIV, Gen.V, Gen.VI, 118cc chamber
    12558162...01-up...oval..CLOSED..Gen.VII,"Vortec 8100", 8.1L, 496, truck
    12560241...98-up...oval..CLOSED.."Vortec 7400", 100cc chambers
    12562932...91-95...oval...OPEN...Gen.V, truck crate motor, 118cc chambers
    12562933...91-95...oval...OPEN...Gen.V, 118cc 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, SignatureSeries, fits MKIV, Gen.V, Gen.VI"raised runners", 2nd design, 115cc chamber
    14044861...84-96...rect..........Bowtie, Aluminum, MkIV"raw" casting of "861" MKIV1st 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...86-90...oval...OPEN...454 Truck, "peanut" round ports
    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 spacing
    25534404...04......rect..........Olds/Chevy, DRCE 3, Pro Stock, aluminum, for blocks with 4.900" bore spacing

    T = Tall deck

    Oval includes both "peanut" (also called "round") ports and large oval ports

    BBC TWO PIECE REAR MAIN OIL SEALS
    3.76" STROKE used on '65-'90 Mark IV 366T, 396, 402, 427 or 427T

    6223.......396,402,427...forged, 1053 steel
    7115.......396,402,427...forged, nitrided, cross-drilled, 5140 steel
    3804816....396,402,427...cast
    3856223....396...forged
    3863114....402...
    3863144....396,402...
    3874874....396,402...
    3879621....427...forged
    3882841....396...forged, cross drilled, nitrided
    3882842....427...forged, cross drilled, nitrided
    3882847....
    3882848....
    3882849....427...forged
    3887114....396...forged, nitrided, 5140 steel
    3904815....396,402...cast, nodular iron
    3941180....
    3942411....
    3965746..........semi finished, forged
    3993804..........raw, 5140 steel

    BBC ONE PIECE REAR MAIN OIL SEAL
    3.76" STROKE used on '91-up Gen.V and Gen. VI 366T, 427T

    10114186...427T...forged, 1053 steel
    10114187...366T...cast
    10114189...427T...cast

    TWO PIECE REAR MAIN OIL SEALS
    4.00" STROKE used on '70-90 Mark IV 454 or Mark IV 502

    3520.......454...forged, cross-drilled, 1053 steel
    3521.......454, 502...forged, cross-drilled, 5140 steel
    3524.......454...forged
    7416.......454, 502...forged, cross-drilled, 1053 steel
    7463.......454...forged
    336782.....454...cast
    353039.....454...cast
    353638.....454...
    359730.....454...
    3962523....454...forged
    3963523....454...
    3963524....454...forged
    3967416....454...forged
    3967463....454...forged
    3975945....454
    3963521....454...forged, cross drilled, 5140 steel
    3965753..........semi finished, forged, 5140 steel
    3975495....454
    3993878....454...forged
    10051169...454...forged raw casting

    ONE PIECE REAR MAIN OIL SEAL
    4.00" STROKE used on '91-up Gen.V and VI 454 or 502
    10114188...454......cast
    14097044...454,502..forged, 1053 steel

    CHEVY 348-409 "W" MOTOR V-8 Crankshaft Casting Numbers
    3732692...348...forged...3.25" stroke
    3733223...348...forged...3.25" stroke
    3733226...348...forged...3.25" stroke
    3741640...348...forged...3.25" stroke
    3741642...348...forged...3.25" stroke
    3788072...409...forged...3.50" stroke
    3795589...409...forged...3.50" stroke
    3824553...348...forged...3.25" stroke
    3829027...409...forged...3.50" stroke
    3837466...409,427 "Z11"...forged...3.65" stroke
    3838416...409...forged...3.50" stroke