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View Full Version : GM Cylinder Heads Casting Numbers



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05-13-2024, 08:26 PM
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