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TO THE BEST OF OUR KNOWLEDGE THE BLOCK NUMBERS NOTED HERE ARE ACCURATE

Chevrolet Block Numbers
Casting # CID Main Bolts
330817 400 2-Bolt
346236 454 2-Bolt
355909 262 2-Bolt
3703524 265 2-Bolt
3720991 265 2-Bolt
3731548 283 2-Bolt
3737739 283 2-Bolt
3751872 348 2-Bolt
3755011 348 2-Bolt
3756519 283 2-Bolt
3771705 348 2-Bolt
3782870 327 2-Bolt
3788068 409 2-Bolt
3789935 283 2-Bolt
3790721 283 or 327 2-Bolt
3791362 327 2-Bolt
3794226 283 2-Bolt
3795623 409 2-Bolt
3798962 348 2-Bolt
3830814 409 or 427 2-Bolt
3834810 283 2-Bolt
3834812 283 2-Bolt
3844422 409 2-Bolt
3849852 283 2-Bolt
3855961 396 2-Bolt
3855962 396 4-Bolt
3857656 409 2-Bolt
3858174 327 2-Bolt
3858180 327 2-Bolt
3862194 283 2-Bolt
3869942 427 2-Bolt or 4-Bolt
3892657 302 or 327 or 350 2-Bolt
3896944 283 2-Bolt
3902406 396 2-Bolt or 4-Bolt
3903352 327 2-Bolt
3904351 427 2-Bolt or 4-Bolt
3914636 307 2-Bolt
3914660 327 2-Bolt
3914678 302 or 327 or 350 2-Bolt
3916321 427 2-Bolt or 4-Bolt
3916323 396 2-Bolt or 4-Bolt
3932386 302 or 350 4-Bolt
3932388 302 or 350 4-Bolt
3935439 427 2-Bolt or 4-Bolt
3935440 396 2-Bolt or 4-Bolt
3946052 427 4-Bolt
3951509 400 2-Bolt or 4-Bolt
3951511 400 4-Bolt
3955270 427 2-Bolt or 4-Bolt
3955272 396 2-Bolt or 4-Bolt
3956618 302 or 327 or 350 2-Bolt or 4-Bolt
3956632 307 2-Bolt
3963512 427 or 454 2-Bolt or 4-Bolt
3969854 396 or 402 2-Bolt or 4-Bolt
3970010 350 2-Bolt or 4-Bolt
3970014 350 2-Bolt or 4-Bolt
3970020 307 2-Bolt
3970024 307 2-Bolt
3999289 454 2-Bolt
3999290 402 2-Bolt

 

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