Chevrolet Engine Block Numbers

Chevrolet Engine Block Numbers

All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code.


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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