• Big block


    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

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