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CHEVY V-8 Crankshaft Casting Numbers

Here's a list of Chevy V-8 crankshaft casting numbers. Make sure your crank will work in the block you have. Blocks were made for each crank main journal size. If you are putting a "small" journal smallblock crank into a "medium" journal smallblock block you will need crank bearing "spacers" or use special "thick" bearings available from aftermarket suppliers. Cranks also use either a two piece rear main oil seal or a one piece rear main oil seal. Oil seal adaptors are available from Chevy or aftermarket suppliers, if you are trying to put a crank designed for a two piece seal into a block made for a one piece seal.



CHEVY SMALLBLOCK V-8 Crankshaft Casting Numbers



SBC TWO PIECE REAR MAIN OIL SEALS

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
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....3.76" stroke

SBC ONE PIECE REAR MAIN OIL SEAL

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


CHEVY BIG BLOCK V-8 Crankshaft Casting Numbers

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....366T,396,402,427T
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

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
3815822...348...forged...3.25" 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