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Chevy Crankshaft Casting Numbers

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Chevy Crankshaft Casting Numbers
SBC One Piece Main Seal
BBC 3.76 Stroke Two Piece Main Seal
BBC 3.76 Stroke One Piece Main Seal
BBC 4.00 Stroke Two Piece Main Seal
BBC 4.00 Stroke One Piece Main Seal
348-409 W
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Chevy V-8 Small and Big Block Crankshaft Casting Numbers and Data

There is a lot of misinformation on the internet about these numbers. We have taken the time to verify the data as much as possible. There still may be errors. Please lets us know if you find one.

Small Blocks - Two Piece Main Seal

Number C.I.D. Type Journal Stroke Description
1130 327 Forged Medium 3.25
1178 302 Forged Medium 3.00
1181 305/350 Cast Medium 3.48
1182 350 Forged Medium 3.48
2680 327 Forged Small 3.25
2690 350 Forged Medium 3.48
3279 302 Forged Medium 3.00
3474 283 Forged Small 3.00 Military Tank
4577 327 Forged Small 3.25
4672 327 Forged Medium 3.25
310514 350 Cast Medium 3.48
330550 350 Cast Medium 3.48
354431 262 Cast Medium 3.10
3727449 283 Forged Small 3.00
3729449 265 Forged Small 3.00
3734627 327 Forged Small 3.25
3735236 265,283 Forged Small 3.00
3735263 283 Forged Small 3.00
3782680 327 Forged Small 3.25
3814671 327 Forged Small 3.25
3815822 265,283,302 Forged Small 3.00
3835236 283 Forged Small 3.00
3836266 283 Forged Small 3.00
3848847 283 Forged,Cast Small 3.00
3849847 283 Forged Small 3.00
3876764 283 Forged,Cast Small 3.00
3876768 283 Forged Small 3.00
3884577 327 Forged Small 3.25
3892690 350 Forged Medium 3.48
3911001 307,327 Cast Medium 3.25
3911011 307,327 Cast Medium 3.25
3914672 327 Forged Medium 3.25
3923279 302 Forged Medium 3.00
3932442 267,305,350 Cast Medium 3.48
3941174 307,327 Cast Medium 3.25
3941178 302 Forged Medium 3.00
3941182 350 Forged Medium 3.48
3941188 350 Forged Medium 3.48
3949847 283 Forged,Cast Small 3.00
3951130 327 Forged Medium 3.25
3951529 400 Cast Large 3.75

Small Blocks - One Piece Main Seal

Number C.I.D. Type Journal Stroke Description
10106122 350 Forged Large,2.76 3.66 ZR1,LT5,DOHC
10168568 265 Cast Medium 3.00
12552215 364 Cast Medium 3.62 Gen. III,6.0L
12552216 325,350,364 Cast Medium 3.62 Gen. III 5.7L LS1,5.3L,6.0L
12553312 293 Cast Medium 3.27 Gen. III,4.8L
12553482 293 Cast Medium 3.27 Gen. III,4.8L
14088526 305,350 Cast Medium 3.48
14088532 350 Forged Medium 3.48
14088535 305,350 Cast Medium 3.48
14088552 350 Forged Medium 3.48

Big Blocks - 3.76 Stroke, Two Piece Main Seal

1965-90 Mark IV 366T,396,402,427,427T

Number C.I.D. Type Description
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 Nitrided,Cross-Drilled
3882842 427 Forged Nitrided,Cross-Drilled
3882847
3882848
3882849 427 Forged
3887114 396 Forged Nitrided,5140 Steel
3904815 396,402 Cast Nodular Iron
3941180
3942411
3965746 Forged Semi Finished
3993804 Raw,5140 Steel

Big Blocks - 3.76 Stroke, One Piece Main Seal

1991+, Gen. V,Gen. VI, 366T,427T

Number C.I.D. Type Description
10114186 427T Forged 1053 Steel
10114187 366T Cast
10114189 427T Cast

Big Blocks - 4.00 Stroke, Two Piece Main Seal

1970-90 Mark IV 454,502

Number C.I.D. Type Description
3520 454 Forged 1053 Steel,Cross-Drilled
3521 454,502 Forged 5140 Steel,Cross-Drilled
3524 454 Forged
7416 454,502 Forged 1053 Steel,Cross-Drilled
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 5140 Steel,Cross-Drilled
3965753 Forged 5140 Steel,Semi Finished
3975495 454
3993878 454 Forged
10051169 454 Forged Raw

Big Blocks - 4.00 Stroke, One Piece Main Seal

1991+ Gen. V, Gen. VI, 454,502

Number C.I.D. Type Description
10114188 454 Cast
14097044 454,502 Forged 1053 Steel

Big Blocks - 348-409 W

Number C.I.D. Type Stroke Description
3732692 348 Forged 3.25
3733223 348 Forged 3.25
3733226 348 Forged 3.25
3741640 348 Forged 3.25
3741642 348 Forged 3.25
3788072 409 Forged 3.50
3795589 409 Forged 3.50
3824553 348 Forged 3.25
3829027 409 Forged 3.50
3837466 409,427 Forged 3.65 Z11
3838416 409 Forged 3.50
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