Big Block Chevrolet Block Casting Numbers

Casting Number	Year	CID	HP	MainBolts	Notes
3855961	66-67	396	325/360		2-Bolt main
3855962	65-66	396	360/375 & 425		4-Bolt main
3869942	66-67	427	390 & 425		2 & 4-Bolt main
3873858	66	396	375		4-Bolt main
3902406	67	396	325 350 & 375		2 & 4-Bolt main
3904351	67	427	385-435		2 & 4-Bolt main
3916321	68	427	385-435		2 & 4-Bolt main
3916323	68	396	325 350 & 375		2 & 4-Bolt main
3935439	68-69	427	335-435		2 & 4-Bolt main
3935440	68-69	396	265-375		2 & 4-Bolt main
3946052	69	427	430		4-Bolt main Aluminum ZL-1
3955270	69	427	335-435		2 & 4-Bolt main
3955272	69		265-375		2 & 4-Bolt main
3963512	69-71		335-450		2 & 4-Bolt main
3963513	73-76	454	215		2-Bolt main
3969854	69-72		240-360		2 & 4-Bolt main
3999289	72-78	454	215-270		2-Bolt main
3999290	72	402	240		2-Bolt main
6272177	72	402	210		2 & 4-Bolt main
14015445	75-87	454	210 & up		2 & 4-Bolt main

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