GM Cylinder Heads Casting Numbers

Cylinder Head ID

Use these casting numbers to identify the heads you have.

Small Block Casting numbers

Casting Number	CID	Years	Valves	Comments
10065202	350	82-86	1.94/1.50	76cc
10065203	350	82-86	1.94/1.50	76cc
10065204	350	82-86	1.94/1.50	76cc
10065205	305	82-86	1.84/1.50	58cc
10065206	350	82-86	1.94/1.50	76cc
10065207	305	82-86	1.84/1.50	58cc
10088113	350	86-92	1.94/1.50	58cc Corvette Aluminum
10120928	350	87-94	1.94/1.50	76cc
10125320	350	94-96	2.00/1.55	Gen II LT1 cast iron version,
10128374	350	92-97	2.00/1.55	Gen II LT1 53 CC angle plug aluminum
10134363				Bowtie High Port 60 CC 210 ~ 258 CC
10159550	350	87-94	1.94/1.50	76cc
10159551	305	87-94	1.84/1.50	58cc
10159552	350	87-94	1.94/1.50	76cc
10159553	305	87-94	1.84/1.50	58cc
10185040				Splayed vavle head 45 CC angle plug
10205245	350	93	2.00/1.55	Gen II LT1 angle plug aluminum reverse flow cooling 175/68cc ports
10207643	350	94-97	2.00/1.55	Gen II LT1 angle plug aluminum reverse flow cooling 175/68cc ports
10208890	265	94-96	2.00/1.55	Gen II L99 4.3 Liter V-8, cast iron, reverse flow
10215339	346	97	2.00/1.55	Gen III LS1 aluminum 68cc
10239906	305/350	96-up	1.94/1.50	68cc Vortec
12367713			2.00/1.55	GM Fast burn 62 CC 210 CC intake runner angle plug Vortec
12480005	346	0	2.125/1.625	Gen III LS1 "GTZ" aluminum 38cc angle plug
12480011				SB2.2 head 48 ~ 54 CC angle plug 284 CC intake runner Bare heads.
12480034			2.02/1.60	Bowtie Phase III 64cc Angle plug 184 cc intake runner
12506450	350	87-94	1.94/1.50	76cc
12509859	305	87-94	1.84/1.50	58cc
12516852	350	87-94	1.94/1.50	76cc
12551561	350	96	2.00/1.55	Gen II LT1 angle plug aluminum reverse flow cooling
12552520	305	97-99	1.84/1.5	Vortec Truck L-35
12554290	350	94-96	2.00/1.55	Gen II LT1 cast iron version
12555690	350	96	2.00/1.55	Gen II LT-4 55 CC 195 CC intake runner Angle Plug
12555690	350	96	2.00/1.55	Gen II LT-4 55 CC 195 CC intake runner Angle Plug
12556743	325	99 & UP	2.00/1.55	Gen III 5.3L aluminum truck and van
12558059	305	97	1.84/1.5	L-35 Vortec truck
12558062	350	98	1.94/1.5	L-31 Vortec truck 64cc chambers 170cc intake port
12558062	305/350	96-up	1.94/1.50	68cc Vortec
12558806	346	97-98	2.00/1.55	Gen III LS1 aluminum 68cc
12559853	346	99 & UP	2.00/1.55	Gen III LS1 aluminum 68cc
12559895	325	00 & UP	2.00/1.55	Gen III 5.3L aluminum
12564241	346	00 & UP	2.00/1.55	Gen III LS1 aluminum 68cc
12564243	346	2	2.00/1.55	Gen III LS6 aluminum 68cc
12564243	346		2.00/1.55	Gen III LS-6 vette head 65 CC
14008856	267	79-81	1.71/1.50
14010201	305	82-85	1.84/1.50	58cc
14011034	350	80-up	2.02/1.60	64cc Bowtie
14011049	350	82-up	2.02/1.60	64cc Bowtie Aluminum
14014415	267/305	80-85	1.71/1.50	64cc Crack prone
14014416	267/305/350	80-86	1.84/1.50	64cc Crack prone
14019821	350	80-86	1.84/1.50	76cc
14019924	267	79-81	1.71/1.50
14019926	305	80-86	1.84/1.50
14020516	305/350	80-86	1.84/1.50
14020517	350	80-86	1.84/1.50	76cc
14020555	305	81
14020556	350	81
14022206	350	80	1.94/1.50	76cc
14022301	305	80-86	1.84/1.50	58cc
14022601	267/305	79-86	1.72/1.50 1.84/1.50	58cc
14022801	305	80-86	1.72/1.50	58cc
14034806	267	78-82	1.72/1.50
14034807	305	78-82	1.72/1.50
14034808	350	80-86	1.84/1.50	76cc
14034810	350	80-86
14034811	350	80-86
14039121	305	81-86
14039122	305	81-86
14071114	350	80-86
14075381	350	80-86
14079261	350	82-85
14085844	350	80-86
14089119	350	80-86
14096217	350	90-up	1.94/1.50	64cc Crate heads
14101081	305	87-94	1.84/1.50	58cc
14101083	350	88-94	1.94/1.50	64 cc
14102187	305	87-95	1.84/1.50	58cc
14102191	305/350	87-95	1.84/1.50
14102193	305/350	87-95	1.84/1.50
24502559		96-97		Bowtie SB2 1st design"mirror ports" aluminum
25534351C			2.00/1.55	Vortec Bowtie 65 CC 175 cc intake runner
25534371C			2.00/1.55	Vortec Bowtie 65 CC 206 cc intake runner
3238882	350	68-69	1.94/1.50	76cc
3297185	307/327/350	57-67	1.72/1.50
330545	350/400	71-75	2.02/1.60	76cc
330862	400	71-73	1.94/1.50
333881	350	71-76	2.02/1.60	76cc
333882	350/400	70-80	1.94/1.50	76cc
340292	350	73-80	2.02/1.60	64cc Angle plugs turbo' head No heat riser
354434	262/305	75-80	1.72/1.50	60cc
358741	262/305	71--79	1.72/1.50
359944	350	71-79	1.94/1.50	76cc
3636839	265	55	1.72/1.50
3703523	265	55	1.72/1.50	195HP
3713358	265	55-56	1.72/1.50
3713569	265	55-56	1.72/1.50
3725306	265	56	1.72/1.50	210HP Corvette
3731262	265	56	1.72/1.50	Dual Quad Corvette
3731539	283	57-66	1.72/1.50	283HP Corvette
3731544	265/283	55-61	1.72/1.50	Dual Quad Corvette
3731554	265/283	55-63	1.72/1.50
3731556	283	57	1.72/1.50
3731762	265	56	1.72/1.50	Dual Quad Corvette
3737775	283/327	62-67	1.72/1.50
3740997	283	57	1.72/1.50	Dual Quad FI & 4-brl 220-270HP
3743056	283	58	1.72/1.50
3743096	327	62-67	1.72/1.50
3747363	265	57-62	1.72/1.50
3748056	327	62-67	1.72/1.50
3748720	283	57-58	1.72/1.50	Dual Quad FI & 4-brl Corvette
3748770	283	55-62	1.72/1.50	Dual Quad FI & 4-brl Corvette
3748772	283	57-62	1.72/1.50	Dual Quad FI & 4-brl Corvette
3755537	283	57-62	1.72/1.50
3755538	283	59	1.72/1.50	250-290HP FI Corvette
3755539	283	58-62	1.72/1.50
3755549	283	57-62	1.72/1.50
3755550	283	57-62	1.72/1.50	Dual Quad FI & 4-brl Corvette
3755585	327	62-67	1.72/1.50
3755896	283	62-64	1.72/1.50
3760116	283	59	1.72/1.50	Dual Quad FI & 4-brl Corvette
376445	350	80-84	1.72/1.50
376450	262/305	75-76	1.72/1.50
376495	350	Jun-79	1.94/1.50	76cc
3767460	265/283/327	55-67	1.72/1.50	Car & Truck Corvette
3767462	327	62-67	1.72/1.50
3767465	283	60-61	1.72/1.50	Dual Quad FI & 4-brl Corvette
3767754	283	60-61	1.72/1.50
3767792	283	60-67	1.72/1.50
3770126	327/350	67-70	1.94/1.50
3773012	265	55	1.72/1.50
3774634	327	64-67	1.72/1.50
3774682	283/327	60-67	1.72/1.50
3774684	283/327	57-67	1.72/1.50
3774690	283	58	1.72/1.50	FI Corvette
3774692	283	58-64	1.72/1.50	Dual Quad FI & 4-brl Corvette
3782461	302/327/350	61-70	1.94/1.50	Dual Quad FI & 4-brl Corvette 2.02/1.60 Doubble humps 64cc
3782462	327	67	1.94/1.50	Corvette 2.02/1.60
3792563	327	65-67
3795896	283/307/327	58-72	1.72/1.50	60cc
3796896	283	64-67	1.72/1.50	60cc Chevy II
3798996	327	63-67
3814462	350	67	1.94/1.50
3814480	283/327	60-67	1.72/1.50
3814482	327	62-67	1.72/1.50
3817680	283	59	1.72/1.50	FI 4-brl
3817681	327	62-67	1.72/1.50
3817682	283	61-62	1.72/1.50
3836839	265	55	1.72/1.50
3836842	283/327	57-67	1.72/1.50
3836924	283	63-64	1.72/1.50
3836942	283	58-62	1.72/1.50
3837063	283	58-62	1.72/1.50
3837064	265/283	56-62	1.72/1.50
3837065	265	55-56	1.72/1.50
3837775	283/327	62-67	1.72/1.50
383882	400	71-73
3848720	283	57-58	1.72/1.50
3849820	327	65	1.72/1.50
3854520	283/327	62-67	1.72/1.50
3867802	283	57-60	1.72/1.50	FI Corvette
3873064	265	56-57	1.72/1.50
3876487	350	71-73	1.94/1.50	76cc
3876775	283/327	57-67	1.72/1.50	76cc
3878775	327	64-67	1.72/1.50
3884520	283/327	60-67	1.72/1.50	60cc
3890462	302/327/350	62-68	1.94/1.50 2.02/1.60	64cc Doubble humps
3891462	302/327/350	62-67	1.94/1.50 2.02/1.60	64cc
3891492	327	64-67	1.94/1.50
3911011	327	68
3911032	307/327	68-70	1.72/1.50	70cc
3912264	283	58-62	1.72/1.50
3912265	283	63-64	1.72/1.50
3912291	302/327/350	68-70	1.94/1.50 2.02/1.60	64ccDoubble humps
3912311	350	67	1.94/1.50
3912313	327	65-73	1.72/1.50
3917264	302	67	2.02/1.60	64cc Z-28
3917290	327	68-70	1.72/1.50
3917291	302/327/350	62-69	1.94/1.50 2.02/1.60	64cc Doubble humps
3917292	327	67-68	1.94/1.50
3917293	307/327	68-69	1.72/1.50	76cc
3921175	327	66	1.94/1.50
3923441	350	67-76	1.94/1.50	76cc
3927185	307/327/350	68-79	1.72/1.50	70cc
3927186	302/327/350	68-72	1.94/1.50 2.02/1.60	64cc Doubble humps Bolt holes
3927187	302/350	69-70	2.02/1.60	64cc Corvette
3927188	307/327/350	69	1.72/1.50	76cc
3928454	307	68	1.72/1.50
3928455	302/327	68	2.02/1.60	64cc 325 & 350HP
3928494	327	68	2.02/1.60	64cc 350HP 4-brl
3928495	327	68	1.72/1.50
3931633	307	68-73	1.72/1.50
3931635	350	68-76	1.94/1.50	76cc
3931637	327	68-69
3931638	327	68	1.72/1.50
3931639	302	68	2.02/1.60	64cc
3932441	327/350	67-79	1.94/1.50	76cc
3932454	307/350	68-799	1.72/1.50	76cc
3933148	350	68-73		76cc
3941174	327	68	1.72/1.50
3946812	350	69	1.72/1.50
3946813	350	69-79		76cc
3947014	350	68-70
3947040	302/327/350	68-70	1.94/1.50 2.02/1.60	64cc
3947041	302/327/350	68-79	1.94/1.50 2.02/1.60	64cc
3951598	400	70-71	1.94/1.50	76cc
3961598	400	70-76	1.94/1.50	76cc
3964286	350	68-77	1.94/1.50	76cc
3970126	327/350	67-79	1.72/1.50
3973195	400	71-73	1.94/1.50	76cc
3973414	327/350	64-70	2.02/1.60	64cc Z-28 LT-1 corvette
3973487	350	68-79	1.94/1.50 2.02/1.60	76cc
3973487X	350	68-73	1.94/1.50 2.02/1.60	76cc X cast 10cc's
3973493	400	70-76	1.94/1.50	76cc
3986316	350	71-72	2.02/1.60	76cc
3986330	350	69-79	1.94/1.50	76cc
3986339	307/350	68-79	1.72/1.50	76cc
3986388	350	68-79	1.72/1.50	76cc
3990941	307/350	68-82
3991492	327/350	68-73	1.94/1.50 2.02/1.60	64cc Angle plug
399380	400	70-73		76cc
3997417	307	71	1.72/1.50
3998916	350/400	72-75	2.02/1.60	76cc
3998920	350	72-75	1.94/1.50	76cc
3998991	307/350	68-79	1.72/1.50	76cc
3998993	307/350	68-79	1.71/1.50 1.94/1.50	76cc
3998997	350/400	71-73	1.94/1.50	76cc
426424	305/350/400	72-82	1.72/1.50
458624	350	69-84	1.94/1.50	76cc
460703	350	78-80	1.94/1.50	76cc
462614	305/350	77-79	1.72/1.50
462624	350	76-87	1.94/1.50 2.02/1.60	76cc Crack prone
464033	350	76-86	1.94/1.50	76cc
464036	350	76-86	1.94/1.50	76cc
468642	350/400	75-84	1.72/1.50
471513	267	79-81	1.72/1.50
472424	305	76-79	1.72/1.50
474213	305	78-82	1.72/1.50
474214	350	78-82	1.94/1.50	76cc
475590	400	78-82	1.94/1.50	76cc
517513	267	79-81	1.72/1.50
6259515	350	73
6260855	350	73-75	1.94/1.50	76cc
6260856	350	73-76	1.94/1.50	76cc
6272070	350	73
10045427				Pontiac/Chevy Aluminum, 91cc chamber Large Rectangle Port
10049875				Pontiac/Chevy Aluminum Small Rectangle port
10051128	454	90-94	2.19/1.88	72cc Bowtie Aluminum Rectangular port 400cc intake
10052902	427			Oval Port Open chamber
10101136	454	91-94	2.06/1.77	Open chamber Oval port
10101140	366/427	91-01		Oval Port Closed chamber
10114156	454	91-01		Oval Port Open chamber
10121033	454	78-88	2.06/1.77	Open chamber Oval port
10141279	454	96-01		Vortec 7400 100cc chambers Oval Port
10487052	366	77-90		Oval Port Open chamber
12352783	454	79-93	2.06/1.77	Open chamber Oval port
12363391				Oval Port Bowtie Aluminum Signature Series
12363401				Rectangle Port Bowtie Aluminum Signature Series
12558162	496	01 & UP		Gen.VII Vortec 8100 8.1L truck
12560241	454	98-01		Vortec 7400 100cc chambers Oval Port
12562932	454/502	91-95		Oval Port truck crate motor 118cc chambers
12562934	502	00 & UP		GenVI Marine
14011077	454	89-94	2.19/1.88	118cc Replacement Aluminum Rectangular port 295cc intake
14025175	454	83-93	2.06/1.77	Open chamber Oval port
14044861	454	89-94	2.19/1.88	106cc Bowtie Aluminum Rectangular port 380cc intake
14081044	454	86-90	2.06/1.77	Open chamber Oval port
14081045	454	78-87		Oval Port Open chamber
14081052	366/427/454	85-87		Oval Port Open chamber
14092359	427	86-89	2.06/1.77	Open chamber Oval port
14092360	454	85-89	2.06/1.77	Open chamber Oval port
14096188	454	87-94	2.19/1.88	118cc Replacement Rectangular port 325cc intake
14097088	502	89-date	2.19/1.88	118cc Replacement Rectangular port 325cc intake GEN V
14101398	454	86-90	2.06/1.77	Open chamber Oval port
24502585				Olds/Chevy DRCE 2 Pro Stock aluminum
330864	366/427/454	70-81	2.06/1.77	Open chamber Oval port
330865	366/427/454	70-84	2.06/1.77	Open chamber Oval port
330866	366/427	68-78		Oval Port Open chamber
330867	427	68-73		Oval Port Open chamber
336768	427	73-76		Oval Port Open chamber
336781	454	73-85	2.06/1.77	113cc Oval port
343771	366/427/454	68-85	2.06/1.77	Open chamber Oval port
343772	366/427/454	76-84	2.06/1.77	Open chamber Oval port
343783	454	75-78	2.06/1.77	Open chamber Oval port
346236	454	75-87	2.06/1.77	113cc Oval port
346238	454	75-87	2.06/1.77	113cc Oval port
352625	454	70-76		Oval Port Open chamber
353049	454	70-73	2.06/1.77	113cc Oval port
366765	427/454	73-84	2.06/1.77	Open chamber Oval port
3732791	348	58
3758379	348	59-61
3759256	348	58
3767738	348	59-61
3781147	348	60-61		High Perf
3795586	409	61		360HP
3814690	409	62-64		High Perf
3819333	348/409	62-65
3830817	409	63-65		340HP
3837731	409	63		High Perf Z-11
3852583	409	65		400HP
3856206	396	65-66	2.06/1.77	98cc Oval port
3856208	396	65	2.06/1.77	109cc Z-16/L-37 Rectangular port
3856213	366	66-70	2.06/1.77	Closed chamber Oval port
3856260	396	68		Oval Port Closed chamber
3872702	396/427	66	2.06/1.77	98cc Oval port L-34/L-35/L-36
3873858	396/427	66-67	2.06/1.77	109cc L-78/L-72 Rectangular port
3876875	427	66-70	2.06/1.77	Closed chamber Oval port
3904390	396/427	66-67	2.06/1.77	98cc Oval port L-34/L-35/L-36
3904391	396/427	65-67	2.06/1.77	107cc L-78/L-71/L-72 Rectangular port
3904392	427	67	2.19/1.88	106cc L-88/L-89 Aluminum Rectangular port
3904393	366	66-68	2.06/1.77	Closed chamber Oval port
3908952	427	67		Oval Port Open chamber
3909802	396/427	66-67	2.06/1.77	100cc Oval port L-34/L-35/L-36/L-68
3917215	396/427	67-69	2.06/1.77	100cc Oval port L-34/L-35
3917219	366/427	66-70	2.06/1.77	Closed chamber Oval port
3919840	396/427	67-69	2.06/1.77	107cc L-78/L-71/L-72 Rectangular port
3919842	396/427	68-69	2.19/1.88	106cc L-88/L-89 Aluminum Rectangular port
3931063	396/427	69-70	2.06/1.77	100cc Oval port L-34/L-35
3933148	366/396/427	69	2.06/1.77	122cc Oval port
3933149	427	69-70	2.06/1.77	122cc Oval port
3935401	427	68-76		Oval Port Open chamber
3946074	396/454	69-71	2.19/1.88	118cc L-88/ZL-1 Aluminum Rectangular port
3964280	427/454	66-70	2.06/1.77	Closed chamber Oval port
3964290	396/402/427/454	69-70	2.06/1.77	100cc Oval port
3964291	396/402/427/454	69-70	2.19/1.88	108cc L-78/L-71/L-72/LS-6 Rectangular port 325cc intake
3964292	454	70	2.19/1.88	109cc LS-6 Rectangular port
3965198	396	69	2.06/1.77	Open chamber Oval port
3975950	366/427	68-70	2.06/1.77	Closed chamber Oval port
3986133	366/427	70-85	2.06/1.77	Closed chamber Oval port
3986136	366/427	70-84	2.06/1.77	Closed chamber Oval port
3993820	402/454	71	2.06/1.77	113cc Oval port
3994025	454	71	2.19/1.88	118cc LS-6 Rectangular port
3994026	454	71	2.19/1.88	118cc LS-6 Rectangular port
3999241	402/454	72	2.06/1.77	113cc Oval port
473328	366	68-85	2.06/1.77	Open chamber Oval port
6258723	454	71	2.19/1.88	118cc LS-6 Rectangular port
6272292	402/454	71	2.06/1.77	Open chamber Oval port
6272990	454	71-94	2.19/1.88	118cc Replacement Rectangular port 325cc intake