Cylinder Head ID Numbers

Cylinder Head ID 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