Big Block Casting Numbers

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BIG BLOCK CHEVROLET CASTING NUMBERS

Engine Blocks

3855961	1966	396	325 / 360 hp	2 bolt
3855962	1965-66	396	360 / 375 hp	2 & 4 bolt
3869942	1966	427	390 / 425 hp	2 & 4 bolt
3873858	1966	396	375 hp	4 bolt
3902406	1967	396	325 / 350 / 375 hp	2 & 4 bolt
3904351	1967	427	425 hp	4 bolt
3916321	1968	427	425 / 435 hp	4 bolt
3916323	1968	396	325 / 350 / 375 hp	2 & 4 bolt
3935439	1968 - 69	427	435 hp	4 bolt
3935440	1969	396	350 / 350 / 375 hp	2 & 4 bolt
3955272	1969	396 / 402	325 / 350 / 375 hp	2 & 4 bolt
3963512	1969 - 71	427 454	390 / 425 COPO 360 / 365 hp	2 & 4 bolt
3969854	1970 - 91	402 454	375 hp 360 hp	2 & 4 bolt
3999289	1972	454	270 hp	2 bolt
3999290	1972	402	240 hp	2 bolt

Heads Rectangular Port Aluminum

3873858	1964 - 66	396 427	375 hp L-37 / L89 425 hp L 89	closed chamber
3904392	1967	427	430 / 435 hp L-88 / L-71	closed chamber
3919842	1967 - 69	396 427	375hp L-89 430 / 435 hp L-88 / L-71	Closed chamber
3946074	1969 - 71	396 / 402 427 454	375 hp L-89 430 hp ZL-1 425 / 465 hp LS-7	open chamber
10051128	Special Race / symetrical port		round exhaust	semi open 72cc
14011077			D port	open 118cc
14044861	Special Race	high port / not bolt on	W Port	open 105cc

Heads Rectangular Port Cast Iron

3856208	1964 - 65	396	375 / 425 hp L-37	closed chamber
3904391	1964 - 67	396 427	375 hp L-78 425 / 435 hp L-71 / L-72	closed chamber
3919840	1964 - 69	396 427	375 hp L-78 425 hp L-71, 430hp L-72
3964291	1964 - 70	396 / 402 427	375 hp L-78 425 hp L-71, 430hp L-72
3964292	1970	454	450 hp LS-6	closed chamber
3994025	1971 -	454	425 hp LS-6	open chamber
3994026	1971 -	454	425 hp LS-6	open chamber
3996074	1971 -	454	425 hp LS-6	open chamber
6258723	1971 -	454	425 hp	open chamber
6272990	1971 -	454	425 hp	open chamber

Heads Oval Port Cast Iron

336781	1974	454		open chamber
346236	1975	454		open chamber
353049	1973	454		open chamber
3872702	1966	396 427	325 hp L-34,360 hp L-35 390 hp	closed chamber
3904390	1966	427	390 / 400 hp	closed chamber
3909802	1966 - 67	396 427	325 hp L-34, 350 hp L-35 390 / 400 hp	closed chamber
3917215	1966 - 69	396 427	325 hp, 350 hp 335 hp, 385 hp, 390 hp, 400hp	closed chamber
3931063	1966 - 69
3964280	1966 - 70	427 454	335hp, 385hp, 390hp, 400hp 345hp,360hp, 390hp
3964290	1966 - 70	427 454	335hp, 385hp, 390hp,400hp 345hp, 360hp, 390hp
3993820	1970 - 71	402 454	300hp, 330hp 365hp	open chamber
3999241	1970 - 72	402	240hp, 300hp, 330hp 365hp	open chamber
6272292	1971	402 454	240hp 270hp	open chamber

Intake Manifold Casting Numbers
Alloy Recangular Port (Execpt where noted)

3805069	1966 - 68	396	375hp	L-89 / L-78
3866963	1965	396	375hp	L-37
3885069	1966	427	425hp	L-72
3886093	1967	427	430hp	L-88
3894374	1967	427	435hp (3 x 2 barrel)	L-71
3894382	1967	427 (oval port)	400hp (3 x 2 barrel)	L-68
3919850	1968	427 (oval port)	400hp (3 x 2 barrel)	L-68
3919852	1968	427	435hp (3 x 2 barrel)	L-71
3933164	1968 - 69	396 427	375hp 425hp	L-78 / L-89 COPO
3933198	1969	427	430hp	ZL-1
3937795	1969	427 (oval port)	435hp (3 x 2 barrel)	L-68
3937797	1969	427	435hp (3 x 2 barrel)	L-71
3963569	1970 - 91	396 / 402 454	375hp	L-78 / L-89 LS-6
3967474	1971	454	425hp

Cast Iron Oval Port

3966948	1966 - 67	396 427	360hp (Holley) 390hp (Holley)	L-34
3883948	1966 - 68	396	325hp (Q Jet)	L -35
3931067	1969	396	325hp (Q Jet)	L -35
3955287	1970 - 71	402	330hp (Q Jet)	LS-3
6263753	1972	402	240hp (Q Jet)	LS-3

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