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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


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