BBC Engine Block Casting Numbers

Casting #	Year	CID	HP/RPO/Comments/Applications
340220	1972-76	427	tall truck
345014	1974-86	454	truck
346236	1974-76	454	215, 2 bolt
359070	1974-90	454	truck
361959	1973-85	454	car & truck
364776	1968-84	427	tall truck
364779	1968-88	366	tall truck
473478	1968-84	427	tall truck
3782870	1968-76	427	tall truck
3855061	1965-67	396
3855961	1966-67	396	325, 360, 2 bolt
3855962	1965-66	396	360, 375, 425, 4 bolt
3855977	1965-67	366	tall truck
3866961	1966-69	396	Chevy, Chevy truck
3869942	1966-67	427	390, 425, 2&4 bolt
3873858	1966	396	375, 4 bolt
3902406	1967	396	325, 350, 375, 2&4 bolt
3902466	1965-67	396
3904351	1967	427	385, 390, 400, 425, 430, 435, 2&4 bolt
3904354	1966-67	366	tall truck
3916319	1968-85	366	tall truck
3916321	1968	427	385, 390, 400, 425, 430, 435, 2&4 bolt
3916323	1968	396	325, 350, 375, 2&4 bolt
3918319	1966-70	366	Chevy truck, GMC, tall truck
3925521	1968-85	366	tall truck
3928319	1969-73	366	GMC, tall truck
3935439	1968-69	427	335, 390, 400, 425, 430, 435, 2&4 bolt
3935440	1968-69	396	265, 325, 350, 375, 2&4 bolt
3937724	1968-85	366	tall truck
3937726	1968-84	427	tall truck
3955270	1969	427	335, 390, 400, 425, 430, 435, 2&4 bolt
3946052	1969	427	430 ZL-1, 4 bolt, aluminum
3955272	1969	396/402	265, 325, 350, 375, 2&4 bolt
3955274	1968-85	366	tall truck
3955276	1968-84	427	tall truck
3963512	1969-71	427	335, 390, 400, 425 COPO, 430, 435,
		454	345, 360, 365, 390, 425, 450 2&4 bolt
3963513	1973-76	454	215
3965440	1968-69	396
3965449	1968-72	396
3965540	1968	396
3969854	1969-72	396/402	240, 265, 300, 325, 330, 350, 375,
		454	360, 2&4 bolt
3969858	1968-84	427	tall truck
3999289	1972-78	454	215, 235, 240, 270, 2 bolt, car & truck
3999290	1972	402	240, 2 bolt
3999293	1968-85	366	tall truck
3999294	1968-84	427	tall truck
6272176	1968-76	366	Chevy, GMC, tall truck
6272177	1972	402	210
6272181	1973-76	427	tall truck
1401544	1975-87	454	truck

Big Block Chevy Cylinder Heads
Open vs. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head.

Use of either style head requires that the correct pistons are used, otherwise...

BBC Cylinder Head Casting Numbers
RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust

Casting	Years	CID	Chamber	CC	HP/RPO/Comments
3904392	1967	427	Closed	106.8	430, 435 L-88/L-89, 1.72 ex
3919842	1968-69	396			375 L-89
		427	Closed	106.8	430, 435 L-88/L-89, 1.84 ex
3946074	1969-71	396,402			375 L-89, 427 430 L-88/ZL-1
		454	Open	118.0	425, 465 LS-6/LS-7, round ex
10051128	1990-94	454	Semi Open		72cc, IP 400cc, bowtie, sym port
14011077	1989-94	454	Open		118.0cc, IP 295cc, replacement, C port
14044861	1989-94	454	Open		425, 105.0cc, IP 380cc, bowtie, W port
3856208	1965	396	Closed	108.9	375, 425 Z-16/L-37, 1.72 ex
3873858	1966-67	396			375 L-78
		427	Closed	108.9	425 L-72, 1.72 ex
3904391	1965-67	396			375 L-78
		427	Closed	106.8	425, 435 L-71/L-72, 1.72 ex
3919840	1967-69	396			375 L-78, 1.72.ex
		427	Closed	109.0	425, 435 L-71/L-72, 425 COPO
3964291	1969-70	396/402			375 L-78, Intake Port 325cc
		427			425, 435 L-71/L-72
		454	Closed		450 LS-6, 108.0cc
3964292	1970	454	Closed		450 LS-6, 109.0cc
3994025	1971	454	Open		425 LS-6, 118.0cc
3994026	1971	454	Closed		425 LS-6, 118.0cc
6258723	1971	454	Open		425
6272990	1971-94	454	Open		425, 118.0cc, IP 325cc
14096188	1987-94	454	Open		425, 118.0cc, IP 325cc, replacement
14097088	1989-94	502	Open		GEN V, 118.0cc, IP 325cc, replacement

OVAL PORT - Valve size 2.06 intake, 1.72 exhaust

Casting	Years	CID	Chamber	CC	HP/RPO/Comments
330864	1970-81	366/427/454	Open
330865	1970-84	366/427/454	Open
336765	1973-84	427/454	Open
336781	1973-85	454	Open		113.0cc
343771	1968-85	366/427/454	Open
343772	1976-84	366/427/454	Open
343783	1975-78	454	Open		car & truck
346236	1975-87	454	Open		113.0cc
346238	1975-87	454	Open		113.0cc
353049	1970-73	402/454	Open		113.0cc
473328	1968-85	366	Open
3856206	1965-66	396	Closed		325 97.2cc
3856213	1966-70	366	Closed		truck
3872702	1966	396			325, 360 L-34/L-35
		427	Closed		390, L-36 98.4cc
3876875	1966-70	427	Closed		truck
3904390	1966-67	396			325, 350 L-34/L-35
		427	Closed		390, 400, L-36/L-68 98.4cc
3904393	1966-68	366	Closed		truck
3909802	1966-67	396			325, 350 L-34/L-35
		427	Closed		385, 390, 400, L-36/L-68 100.9cc
3917215	1967-69	396			325, 350 L-34/L-35
		427	Closed		335, 385, 390, 400 100.9cc
3917219	1966-70	366/427	Closed		truck
3931063	1969-70	396			325, 350 L-34/L-35
		427	Closed		335, 385, 390, 400 100.9cc
3933148	1969	366/396	Open		2V/427 265 122.1cc car & truck
3933149	1969-70	427	Open		122.1 cc truck
3964280	1966-70	427			335, 385, 390, 400
		454	Closed		345, 360, 390 LS-5
3964290	1969-70	396/402			325, 330, 350
		427			335, 385,390, 400
		454	Closed		345, 360, 390 LS-5 100.9cc
3965198	1969	396			truck
3975950	1968-70	366/427	Closed		truck
3986133	1970-85	366/427	Closed		truck
3986136	1970-84	366/427	Closed		truck
3993820	1971	402			300, 330 LS-3
		454	Open		365 LS-5 113.0cc
3999241	1972	402			240, 300, 330 LS-3
		454	Open		365 LS-5 113.0cc
6272292	1971	402			240, LS-3
		454	Open		270, LS-5
10101136	1991-94	454	Open		truck
10121033	1978-88	454	Open		truck
12352783	1979-93	454	Open		truck
14025175	1983-93	454	Open		truck
14081044	1986-90	454	Open		truck
14092359	1986-89	427	Open		truck
14092360	1985-89	454	Open		truck
14101398	1986-90	454	Open		truck

BBC Camshaft Part Numbers

Part #	Year	Type	Lift	Dur @ .050 lift	Comments/Specs/RPO's/Apps
340282		Solid	.560I/.560E	.262I/.262E	121 deg overlap, competition-short track apps
353040	1973-74	Hyd	.440I/.440E	.210I/.210E	production Corvette
3863143	1965-71	Solid	.520I/.520E	.242I/.242E	See Note 1
3883986	1965-72	Hyd	.460I/.488E	.213I/.217E	See Note 2
3904362	1965-71	Solid	.520I/.520E	.242I/.242E	See Note 3
3925533	1965-69	Solid	.540I/.560E	.262I/.269E	133 deg overlap, 427 L-88, Reverse rotation
3925535	1965-69	Solid	.540I/.560E	.262I/.269E	133 deg overlap, 427 L-88, standard rotation
3959180	1969-70	Solid	.560I/.600E	.262I/.273E	135 deg overLap, 427 ZL-1, 454 LS-7
3994094		Solid	.600I/.600E	.286I/.286E	See Note 4
6272989		Hyd	.500I/.500E	.222I/.221E	121 deg overlap, marine grind or HP street
14096209		Hyd	.500I/.500E	.222I/.221E	121 deg overlap, marine grind or HP street (6272989)

Note 1: 80 deg overlap, 396 375hp L-78/L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP street
Note 2: 396 325/350hp L-34/L-35, 427 385/390/400hp L-36/L-68, 454 345/360/390hp LS-4/LS-5, good torque/HP
Note 3: 80 deg overlap, 396 375hp L-78/ L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP street
Note 4: 148 deg overlap, maximum power with F.I. or tunnel ram, Can Am

BBC Crankshaft Part Numbers

Casting #	Year	CID	Comments/Specs/RPO's/Apps
330570		427	truck,1053,forging number 6223
336782	1970-74	454	with automatic transmission
3879621	1967	427	L-88, See Note 1
3882841	1965-71	396	See Note 2
3882842	1965-69	427	forged, cross drilled, balanced for 11:1 CR
3882849	1966-69	427
3887114	1965	396	tufftrided, 5140
3963521		454	4 in stroke, 5140, raw forged
3963523	1970-71	454	LS-6, See Note 3
3963524	1970-71	454	LS-7, See Note 4
3965746	1965-69	430	raw forged, semi finished, 3.4-3.8 stroke
3965753	1970-72	495	raw forged, semi finished, 3.9-4.25 stroke, 5140
3967811	1968-69	427	L-88/ZL-1, See Note 5
3975945	1970	454	with manual transmission
3993804		427	raw forged, 3.75 stroke, 5140
3993878	1971-72	454	LS-6
10051169		454	raw forged, 4340, 3.75-4.25

Note 1: L-88, with 3/8 in bolt rods, balanced for 12.5:1 CR, tufftrided, cross drilled
Note 2: forged, cross drilled, 3.76 stroke, tufftrided, balanced for 11:1 CR
Note 3: 1053, tufftrided, cross drilled, balanced for 9.25:1 or 11.25:1 CR, forging number - 3520 and 7416
Note 4: 4 in stroke, HD, 5140, LS-7, balanced for 12.5:1 CR, tufftrided, cross drilled
Note 5: tufftrided, 5140, with 7/16 in bolt rods, tufftrided, cross drilled, forging number - 7115

BBC Exhaust Manifold Casting Numbers

Cast #	Years	Side	CID	Applications
329225	1973-76	LH	454
353028	1973-76	LH	454
353030	1973-76	LH	454	police
3856297	1965	LH	396	325
3856301	1965	LH	396	425 Corvette
3856302	1965	RH	396	425 Corvette
3856306	1965	RH	396	325
3857297	1965	LH	396	325
3868874	1965-66	RH	396	325, 360, 375 Z-16
3869925	1965	LH	396	375 Z-16
3872770	1966	RH	396
3880827	1966-69	LH	427/454	Corvette
3880828	1966-72	RH	427/454	Corvette
3880869	1970-72	LH	454	Corvette
3883999	1966	LH	396	325, 360, 375
3884504	1966-67	RH	396/427	325, 385, 390
3892307	1966-67	LH	396/427	325, 390
3902401	1967	LH	396
3904399	1966	LH	396
3909879	1967-70	LH	396/427	COPO/454 325, 350, 375, 425, 430
3909880	1967	RH	396	325, 350, 375
3914613	1968-70	LH	396/427	265, 325, 335, 345, 390, 425
3916178	1968-70	RH	396/427	COPO/454 325, 350, 375, 425, 430
3969869	1970-74	LH	454	Corvette
3989310	1971-72	RH	402/454
3989343	1971-72	LH	402/454
3994045	1973-75	LH	454	police

BBC Intake Manifold Casting Numbers
ALUMINUM RECTANGULAR PORT - Holley 4V

Casting	Years	CID	HP/RPO/Config
3866963	1965	396	375, 425 L-37
3885069	1966-68	396	375 L-78
		427	425 L-72
3886093	1967	427	430 L-88
3894374	1967	427	435 3x2 L-71
3894382	1967	427	400 3x2 L-68, oval port
3919849	1968	427	390 L-36, oval port, Qjet
3919850	1968	427	400 3x2 L-68, ovat port
3919852	1968	427	435 3x2 L-71
3919878	1968	396	375 L-78
		427	425 L-72
3933163	1968-69	396	375 L-78/L-89
		427	425 copo
3933198	1968-69	427	430 L-88/ZL-1
3937793	1968	427	390 L-36, oval port, Qjet, Late
3937795	1969	427	400 3x2 L-68, oval port
3937797	1969	427	435 3x2 L-71
3947801	1969	427	390 L-36, oval port, Qjet
3963569	1970-71	396/402	375 L-78/L-89
		454	LS-6, lowrise
3967474	1971	454	425
6269318	1972	454

BBC Intake Manifold Casting Numbers
IRON OVAL PORT - Rochester Q-jet 4V

Casting	Years	CID	HP/RPO/Config
336789	1974	454	235, 270
346242	1975	454	215
353015	1973	454	215, 245
393841	1973-75	454	215
3856289	1965-66	396	325 L-35
3866948	1966-67	396	325, 360 L-34/L-35
		427	390, Holley
3883948	1966-68	396	325 L-35
		427	385, 390 L-36
3931067	1969	396	325 L-35
		427	335, 390 L-36
3952900	1969	396	265 2V
3955287	1970-71	402	300, 330, 350 LS-3
		454	360, 365, 390
6263753	1972	402	240 LS-3
		454	240, 270