Pre 1973

CASTING#.....YEAR...ENGINE SIZE...NOTES

330545.....73......350..........76cc chamber, 2.02/1.60
333881.....74-75...350..........76cc chamber, 2.02/1.60
333882.....74-80...350/400......76cc chambers
340292.....70's.......Over the counter, angle plug, 64cc chamber
354434.....75-79...262/267/305...60cc chambers
358741.....76-79...305
376445.....77-85...350..........76cc chamber, small valves
376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber
462614.....77-79...305..........60cc chamber
462624.....75-86...350/400......76cc chamber, 1.72/1.5, 1.94/1.5 or 2.02/1.6 valves
458642.....75-84...350..........350
468642.....76-up...350/400
471513.....79......267/350
517513.....79......267/350
1816887....63......283..........Made in "Canada", GMC HD truck
3636839....55......265
3703523....55......265
3713358....55-56...265
3713569....55-56...265
3725306....56......265
3731539....57......283..........283 HP FI
3731544....57-61...283
3731554....57-62...283
3731556....57......283..........Truck, Made in Canada
3731762....56......265..........Vette, 2x4 carbs
3737775....62-67...283/327
3740997....57......283..........1x4, 2x4 & FI (exc.-283hp)
3743056....58......283
3743096....62-67...327..........GMC Truck
3747363....57-61...283
3747460....59-67...283/327......70cc chambers
3748770....58......283
3748772....58-61...283
3755537....57-62...283
3755539....58-62...283
3755549....57-62...283
3755550....59......283
3755585....62-67...327..........GMC Truck
3767460....59-60...283
3767462....62-67...327
3767465....59-61...283
3767754....59-61...283..........60cc chambers
3767792....60-64...283
3774682....60-64...283/327......70cc chambers
3774684....62-64...327..........75cc chambers
3774692....58-64...283..........60cc chambers
3782461....64-66...327......Camel hump,no accessory holes,160/62cc port volumes,62cc chamber
3782461X...60-63...283/327..Camel hump,no accessory holes,larger 172/64cc port volumes, 62cc chamber
3795896....63-65...283......60cc chamber
3795896....62-64...327......60cc chamber
3798996....63-67...327
3814480....60-67...283/327..70cc chambers, 1.72/1.5 valves
3814482....62-67...283/327/350..75cc chambers
3817680....63-67...283/327
3817681....62-67...327
3817682....61-62...283
3836839....55......265
3836842....57-67...283/327
3837064....56-62...265/283
3837065....55-56...265..........Truck
3848720....57-58...283
3876775....60-67...283/327......75cc chamber
3884520....60-67...283..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker
3884520....62-67...327..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker
3890462....66-67...302/327/350..Camel hump,no accessory holes,64cc chamber
3901068....87-up...350..........Crate motor, 285hp, 64cc chamber
3911032....68......307/327......70cc chamber
3912264....58-62...283
3912265....63-64...283
3912311....65-67...327
3912313....65-67...327
3917290....67-68...307/327
3917291....67-68...302/327/350..Camel hump,no accessory holes,64cc chamber
3917292....68......327/350......Camel hump,64cc chamber
3917293....68......307/327......75cc chambers
3927185....69-76...307/327/350..70cc chambers
3927186....69-70...302/350......Camel hump,64cc chambers,accessory holes
3927187....69-70...350..........Camel hump,64cc chambers,accessory holes
3927188....69......327..........74cc chambers
3927188....70......307..........74cc chambers
3931633....68-73...307
3931635....68-76...350
3931638....68......327..........Truck
3932441....69-70...350..........76cc chambers
3932441X...69-70...350/400......80cc chambers
3932454....69-73...307
3932454....69-79...350..........Truck
3946812....69......350
3946813....69-79...350..........Truck
3947040....68......327.........."Right angle" casting identifier, 64cc chambers, good HP head, used in trucks, no accessory holes
3947041....69-70...302/350......"Right angle" casting identifier, 64cc chamber, accessory holes, good HP head
3947041X...69-70...302/350......"Right angle" casting identifier, 64cc chamber, 165cc intake port, accessory holes, good HP head
3951598....70......400..........76cc chambers
3964286............350
3965742....70......350..........over the counter, angle plug
3970126....67-71...327/350
3973370....69-70...350..........over the counter in US, Canadian 350/300hp production use in Pontiac, 64cc, straight or angle plug
3973414....70......350..........LT1-370hp, Camel hump, 64cc chamber
3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber
3973487X...71-72...350..........75cc chamber
3973493....71-72...400..........76cc chamber
3986316....71......350..........76cc chamber
3986336....71......350..........76cc chamber
3986336X...71......350..........76cc chamber
3986339....71......307/350......74cc chamber
3986339X...71......307/350......74cc chamber
3986388....68-76...307/350
3991492....70......350..........LT1,Camel hump,accessory holes,64cc, straight plug
3991492....70-up................over the counter,Camel hump,64cc, straight or angle plug
3998916....72......350..........also used w/'72 350 LT1,big valves, screw in studs,76cc chambers
3998920....72-73...350
3998991....72-73...307/350......75cc chambers
3998993....72-73...307/350......75cc chambers
3998993....current..350.........Goodwrench crate motors,"Hecho en Mexico",75cc chambers
3998997....72-73...350/400......76cc chambers
3998997....78-84...305/350......76cc chambers
4079261....75......350
10033867........................Aluminum,over the counter Pontiac 23' head,62cc,angle plug, 196cc intake port
10045434........................Over the counter Pontiac 15' head 55cc, angle plug, raised runner aluminum, "roll over" head
10051101........................Bowtie, aluminum, 55cc, angle plug raised runner, 196cc intake port
10065202...87-95...350..........Truck
10065203...87-95...350..........Truck
10065204...87-95...350
10065205...87-95...305
10065206...87-95...350
10065207...87-95...305
10088113...88-up...350..........Aluminum, 58cc, angle plug, raised "D" port exhaust, 1.94"/1.5" valves
10093328........................Over the counter, Pontiac 15' head aluminum,224cc ports, 61cc chambers, "roll over" head
10106178...90......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum
10106179...90......350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum
10110810...91-up...350..........Gen. 1, 65cc chambers
10120928...87-95...350
10125320...94-96...350..........Gen.II LT1, cast iron version, used on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster reverse flow cooling
10128374...92-up...350..........Gen.II LT1, 53cc, angle plug, aluminum, reverse flow cooling, 175/68cc ports
10134352........................Bowtie, 45cc, angle plug, "low" port, 223cc intake port, aluminum, 18' race head
10134363........................NOTE: This casting # has been used in many different versions of this aluminum 18' and 15' Bowtie race head. Different chamber volumes, port volumes, port locations, valve sizes, etc. were used. Check this casting carefully to determine which features it may have. There are at least 6
different versions as of 11/99.
10147898...95-98...350..........Gen.I crate motor
10159550...87-95...350
10159551...87-95...305
10159552...87-95...350
10159553...87-95...305
10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum
10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum
10185040........................Bowtie, aluminum, 45cc chambers, 1st version, symmetrical ports, 263cc intake ports, splayed valves
10185040........................Bowtie, aluminum, 45cc chambers, 2nd version, symmetrical ports, 240cc intake ports, splayed valves
10205245...93......350..........Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes
10207643...94-96...350..........Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes
10208890...94-96...265..........Gen.II, L99, 4.3 Liter V-8, cast iron, reverse flow
10215339...97......350..........Gen.III, LS1, aluminum, 68cc
10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum
10225122...95......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum
10239902...96-up...350..........Gen.II LT4, aluminum, reverse flow cooling, 195cc port, 54.4cc chamber, angle plug
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber, 170cc intake port, 1.94"/1.5" valves
12367712...99-up................"Fast Burn", aluminum, 210cc intake, port, 2.00/1.55 valves, 62cc chamber
12367713...99-up................"Fast Burn" used on ZZ430 crate motor, aluminum, 210cc intake port, 2.00/1.55 valves, 62cc chamber
12480005...2000.................LS1 "GTZ", aluminum, 38cc, 2.125"/1.625" valves, angle plug
12480011...97-up................Bowtie "SB2.2", aluminum, 2nd version of "SB2", 48cc chambers, "mirror ports", revised valve angles & plug location
12506450...87-95...350
12509859...87-94...305
12516852...87-95...350
12551561...96......350..........Gen.II, "LT1", aluminum
12552520...97-up...305..........Vortec, truck
12554290...94-96...350..........Gen.II, "LT1", cast iron version, used on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster reverse flow cooling
12555690...96......350..........Gen.II, "LT4", aluminum
12556743...99......325..........Gen.III, 5.3L, aluminum, truck, van
12558059...97......305..........Vortec, truck, 1.84"/1.5" valves
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port
12558806...97-98...350..........Gen.III, "LS1", aluminum, 68cc
12559853...99-up...350..........Gen.III, "LS1", aluminum, 68cc
12559895...00-up...325..........Gen.III, Vortec 5.3L
12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc
12564243...01-up...350..........Gen.III, "LS6", aluminum
14008856...79-81...267
14094093...86-88...350
14010201...82-85...305
14011034........................Bowtie, cast iron, 64cc chambers, 184cc port volume, angle plug, "Phase II" head
14011049........................Bowtie, aluminum, 55cc chambers, angle plug, 180cc ports, "Phase 6"
14011083...55-86...350..........Crate motor for years indicated. 285/300hp, 64cc chambers, 1.94"/1.5" valves
14014415...80-85...267/305
14014416...80-86...305..........1.84"/1.5" valves, 58cc chambers
14014440...80......305..........1.84"/1.5" valves
14019821...80-86...350
14019924...79-81...267
14019926...80-86...350
14010516...80-86...350
14020517...80......350
14020555...81......305
14020556...81......350
14022056...85......350
14022206...80......350
14022301...80-86...305
14022601...80-86...267/305......1.72"/1.5" or 1.84"/1.5" valves, 53cc chambers
14022801...80-86...305
14024816...........350..........76cc chambers, 1.94/1.5 valves, Gen.I crate motors
14034806...78-82...267
14034807...78-86...305
14034808...80-86...350
14034808...96-up...350..........76cc chambers, 1.94"/1.5" valves, Gen.I Goodwrench crate motors
14034810...80-86...350..........Truck
14034811...80-86...350..........Truck
14039121...81-86...305..........Truck
14039122...81-86...305..........Truck
14071114...80-86...350
14075381...80-86...350..........Truck
14079261...86......350
14085844...80-86...350..........Truck
14085963...86......350
14088526...........350..........Gen.II, LT1, aluminum
14089119...86-88...350
14094093...86-88...350
14096217...55-86...350..........Crate motor, 285hp/300hp, 64cc chambers, 72' or 90' center intake manifold bolt angles
14101081...87-95...305
14101083...87-up...350..........Gen.I, also used on crate motors, 285 or 300 hp, 64cc chambers, 72' center manifold bolt angles
14101128...86-87...350..........Aluminum, 58cc, angle plug
14102187...87-91...305..........1.84"/1.5" valves
14102191...87-up...350
14102193...87-up...305/350......1.94"/1.5" valves
24502559...96-97................Bowtie, "SB2", 1st version, "mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber
25500141........................Buick/Chevy aluminum 10' head, 42cc chambers, symmetrical ports, 235cc intake port volumes, 2.1"/1.625" valves
25534351C..04-up................Gen.I Bowtie, cast iron Vortec head, 175/65cc ports, 2.00/1.55 valves, "small port head"
25534371C..04-up................Gen.I Bowtie, cast iron Vortec head, 206/77cc ports, 2.00/1.55 valves, "large port head"
33417369...90-up...350..........Gen.I Goodwrench crate motor,"Hecho en Mexico", 76cc



Casting # CID Years Additional Comments
6399 307 62-63
330545 350 73 76cc - 2.02"/1.6" valves - Corvette & Camaro
330862 400 70-73 1.94"/1.5" valves
333881 350 74-75 76cc - 2.02"/1.6" valves - Corvette & Camaro
333882 350 74-80 76cc
333882 400 74-80 76cc
340292 70's Service replacement head, 64cc
354434 262/267/305 75-79
358741 305 76-79
376445 305,350 80-84
376450 262,305,350 74-81 7 bolt exhaust bolt holes - 168/60 cc port volumes
376455 350 77-85
376495 350 70-79
378450 305 78-85
458642 350,400 67-70
462624 350,400 75-86 7 bolt exhaust bolt holes
468642 350,400 76-up
471513 267,350 79
517513 267,350 79
3636839 265 55
3703523 265 55 Corvette
3713358 265 55-56
3713569 265 55-56
3725306 265 55-57
3731539 283 57 Corvette w/Rochester mechanical FI
3731544 283 57-61
3731554 283 57-62
3731556 283 57
3731762 265 56 Corvette 2X4
3737775 283,327 62-67
3740997 283 57
3743056 283 58
3743096 327 62-67 GMC truck
3747363 283,327 57-61
3747460 283/327 59-67
3748770 283 58 Corvette 1X4, 2X4, & FI
3748772 283 58-61
3755537 283 57-62
3755539 283 58-62
3755549 283 57-62
3755550 283 59 Corvette
3755585 327 62-67 GMC truck
3767450 305 76-79 7 bolt exhaust
3767460 283 64-67 HD truck only
3767462 327 62-67
3767465 283 59-61
3767754 283 59-61 283 Power Pack
3767792 283 60-64
3770126 327 69
3774682 283,327 60-64
3774684 327 62-64
3774692 283 58-64 60-61 Corvette, 283 Power Pack
3782461 327 64-66 "Camel Hump" head, 161/62cc port volumes
3782461X 60-63 "Camel Hump" head, 172/64cc port volumes
3795896 283,327 63-65 62-64 327/350hp Corvette, 283 Power Pack
3798996 327 63-67
3814480 283,327 60-67
3814482 327,350 62-67 low compression head, 75cc
3817680 283,327 63-67
3817681 327,350 62-67
3817682 283 61-62
3836839 265 55
3836842 283,327 57-67
3837064 265,283 56-62
3837065 265 55-56 GMC truck
3847820 283 57-58
3876775 283,327 60-67 Camaro, 327/210hp
3884520 283,327 66-67 60cc, GM & Studebaker, some Canadian built
3890462 302,327,350 66-67 "Camel Hump" head - 161/65cc port volumes
3901068 350 87-up Goodwrench crate engine, 350/285hp, 64cc, 72° bolt angle
3911032 307,327 68
3912264 283 58-62
3912265 283 63-64
3912311 327 67
3912313 327 65-67
3917290 307,327 67-68
3917291 302,327,350 67-68 "Camel Hump" head, 161/65cc port volumes
3917292 327 68 "Camel Hump" head, Corvette 327/350hp
3917293 307,327 68 75cc
3927185 307,327 69-70 69cc
3927186 302-350 69-70 "Camel Hump" head, 63cc
3927187 350 69-70 "Camel Hump" head
3927188 307 69-70 74cc
3928455 302,327 68
3928494 327,350 68
3928495 327 68
3931633 307 68-73
3931635 350 68-76
3931637 327 68-69
3931638 327 68 GMC truck
3932441 350 69-70 76cc, 161/65cc port volumes
3932441X 350,400 69-70 350- 80cc, 1.94"/1.5" valves; 400- 1.94"/1.6" valves; 165/65cc port volumes
3932454 307 69
3946812 350 69
3946813 350 69-70
3947040 327 68 64cc, GMC truck, no accessory holes, "right angle" casting
3947041 302,350 69-70 64cc, w/accessory holes, "right angle" casting
3951598 400 70 76cc
3964286 350
3965742 350 70 Service head
3970126 327,350 67-70
3973370 350 69-70 Service head, straight or angle plug, 1.940" x 1.500" Valves, 67CC
3973414 350 70 "Camel Hump" head, LT1, 64cc
3973487 350 71-76 71-72 LT1, 75cc, 161/65cc port volumes
3973487X 350 71-72 75cc, larger intake ports
3973493 400 71 76cc
3986316 350 71 Corvette, 76cc
3986336X 350 76cc
3986388 307,350 68-76
3986339 307,350 71 74.5cc
3986339X 307,350 71 74.5cc
3991492 350 70 "Camel Hump" head, LT1, 64cc, straight plug
3991492 71-up Replacement head, 64cc, straight or angle plug
3998916 350 72 LT1, 76cc, screw in studs, large valves
3998920 350 72-73
3998991 307,350 72-73 74.5cc, hardened seats in 73
33998993 307,350 72-73 74.5cc, hardened seats in 73, 159/64cc port volumes
3998993 350 Goodwrench crate engine, Mexican made
3998997 350,400 72-73 76cc, hardened seats in 73
3998997 305,350 78-84 161/65cc port volumes
4079261 350 75
10033687 Pontiac aluminum race head, 62cc, angle plug, 196cc ports, 2.10"/1.625" valves, 23° bolt angle
10045434 Aluminum head, 55cc, angle plug, raised runner design
10051101 Bowtie aluminum head, 55cc, raised runner design, angle plug, 196cc port volume
10088113 350 88-up Corvette, raised runner D port exhaust, 58cc, angle plug, 1.94"/1.5" valves
10093328 Pontiac aluminum head, 15°, 224/61cc volumes
10106178 350 90 Corvette ZR1 LT5, DOHC 32V passenger side
10106179 350 90 Corvette ZR1 LT5, DOHC 32V driver side
10110810 350 93-up
10125320 350 94-96 Gen II 350, LT1, cast iron, reverse flow cooling, Impala SS, & 9C1Police Pkg.
10128374 350 92-up Gen II 350, LT1, aluminum, 53cc, angle plug, reverse flow cooling, 175/68cc port volume
10134352 Bowtie low port aluminum head, 45cc, angle plug, 223cc port volume, 18°
10134363 Bowtie high port aluminum head, 45cc, angle plug, 210cc port volume, 18°
10134363 Bowtie high port aluminum head, 50cc, angle plug, 250cc port volume, 18°, CNC machined, 2.15"/1.625" valves
10134363 Bowtie high port aluminum head, 60cc, angle plug, 215cc port volume, 18°
10134363 Bowtie high port aluminum head, 65cc, angle plug, 18°
10134363 Bowtie high port aluminum head, 35-37cc, 223cc port volume
10147898 350 95-96 Goodwrench crate engine
10174389 350 91-94 Corvette ZR1 LT5, DOHC 32V driver side
10174390 350 91-95 Corvette ZR1 LT5, DOHC 32V passenger side
10185040 Aluminum head, 1st version, 45cc, angle plug, splayed valve, 263cc port volume
10185040 Aluminum head, 2nd version, 45cc, angle plug, splayed valve, 240cc port volume
10205245 350 93 Gen II 350, LT1, aluminum head, reverse flow cooling, 175/68cc port volume
10207643 350 94-96 Gen II 350, LT1, aluminum head, reverse flow cooling
10225121 350 94-95 Corvette ZR1 LT5, DOHC 32V driver side
10225122 350 94-95 Corvette ZR1 LT5, DOHC 32V passenger side
10239902 350 96-up Gen II 350, aluminum head, reverse flow cooling
10239906 350 96-up Vortec 5700, L31, 64cc, 1.94"/1.5" valves, 170cc port volume
102480011 SB2 97-up SB2 2nd version, mirror port, revised plug location & valve angles
12552520 305 96 Vortec 5000 truck
12554290 350 94-96 Gen II 350, LT1, cast iron, reverse flow cooling, Impala SS & 9C1 Police Pkg.
12558062 350 98 Vortec 5700
14096217 350 55-86 350/300hp crate engine, 64cc, 90° intake bolt angle
14010201 305 84
14011034 Bowtie Phase 2 iron head, 64cc, angle plugs, 184cc port volume, 2.02"/1.6" valves
14011049 Bowtie Phase 6 aluminum head, 55cc, angle plug, 180cc ports, 2.02"/1.6" or 2.10"/1.65" valves
14011083 350 55-86 350/300hp crate engine, 64cc, 90° intake bolt angle
14014415 267,305 80-85
14014416 305 80-85 305HO, 58cc, 1.84"/1.5" valves, 7 bolt exhaust
14014440 305 80 305HO, 58cc, 1.84"/1.5" valves
14020517 350 80
14020555 305 81
14020556 350 80-81
14022056 350 81-85
14022301 305 78-79
14022601 267,305 80-85 305HO, 58cc, 1.84"/1.5" valves, 7 bolt exhaust
14022801 305 80-85
14071114 350 80-85
14079261 350 86
14085963 350 85-86
14089119 350 87-88
14094093 350 80-87
14096217 350 87-up 350/285hp crate engine, 64cc, 1.94"/1.5" valves, 72° intake bolt angle
14101081 305 87-91
14101083 350 350/285hp or 300hp crate engine, 64cc, 1.94"/1.5" valves, 90° or 72° intake bolt angle
14101128 350 86-87 Corvette aluminum head, 58cc, angle plug
14102187 305 87-91 305HO, 1.85"/1.5" valves, 58cc, 7 bolt exhaust
14102191 305,350 87-up 7 bolt exhaust
14102193 305,350 87-up 7 bolt exhaust
14022301 305 80-84
14022601 267,305 79-85
14022801 305 80-86
24502559 SB2 96-up Bowtie SB2 aluminum 1st design, mirror port
33417369 350 90-up Gen I Goodwrench, Mexican, 76cc, 1.94"/1.5" valves, 7 bolt exhaust, perimeter valve cover bolts, "heavy" casting
38998997 400 70-80

Casting # Chamber Years CID & Additional Comments
330864 Open 68-84 396, 402, 366T, 427T, 454 Truck
330865 Open 68-76 396, 402, 366T, 427T, 454 Truck
330866 Open 68-78 366T, 427
330867 Open 69-73 427
336765 Open 68-78 427T
336768 Open 73-76 427T
336781 Open 73-84 454, 118cc chamber, 256/114cc ports
343771 Open 68-86 366T, 427T, 454
343772 Open 68-86 366T, 427T, 454
343783 Open 70-76 454
346236 Open 75-87 454, 120cc chamber, 225/116cc ports
348238 Open 75-83 454
352625 Open 70-76 454
353049 Open 73-84 396, 402, 454, 122cc chamber, 255/119cc ports
366765 Open 74-78 427T
370696 -- 65-78 396, 454
386781 Open 73-79 454
473328 Open 68-89 366T
3846206 Closed 65-70 396, 97cc chamber
3856206 Closed 65-83 396, 402, 427T, 454, 366T, 97cc chamber
3856213 Closed 65-82 366T, 427T
3856260 Closed 68 396
3872702 Closed 65-66 396 & 427, 98cc chamber
3876875 Open 77-85 427T
3904390 Closed 65-67 396 & 427, 98cc chamber
3904393 Open 68-76 366T
3908952 Open 67 427, "M.Truck", Marine
3909802 Closed 65-67 396 & 427, 101cc chamber
3917215 Closed 65-69 396 & 427, 101cc chamber
3917219 Closed 66-76 366T, 396, 427T
3931063 Closed 65-72 396 & 427, 101cc chamber
3933148 Closed 69-76 69 396/265hp, 366T, 396, 427T, 112cc chamber
3933149 Open 68-76 427T, 122cc chamber
3935401 Open 67-76 427T
3937734 Open 69 396
3964280 Closed 66-70 427 & 454
3964290 Closed 69-76 396, 402, 427, 454 Big Oval Port, 101cc chamber
3965198 Closed 68-72 396 & 402
3969854 Closed 68-72 396 & 402
3973195 Open 71-76 402
3975950 Open 69-77 366T, 396, 402, 427T
3986133 Open 68-84 366T & 454
3986135 Closed 69-73 366T & 427T
3986136 Open 68-84 396, 402, 427, 454
3993820 Open 68-84 402, 113cc chamber, 255/114 ports, 454 Passenger and Trucks, 113cc chamber, 255/114 ports
3999241 Open 70-73 402 & 454, 113cc chamber
6272290 Open 72-73 402, 427, 454
6272292 Open 70-78 402 & 454
10052902 Open 96- Mk IV, 427T
10101140 Closed 91- Gen V 366T, 427T
10114156 Open 96- Gen.V & VI 454, 118cc chamber
10141279 Closed 96- "Vortec 7400", 100cc chambers
10487052 Open 77-90 366T
12363391 Open 96- Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI, 110cc chamber
12558162 Closed 01- Gen.VII,"Vortec 8100", 8.1L, 496, truck
12560241 Closed 98- "Vortec 7400", 100cc chambers
12562932 Open 91-95 Gen.V, truck crate motor, 118cc chambers
14081045 Open 78-87 454
14081052 Open 85-87 366T, 427T, 454
14092359 Open 86-90 366T & 427T Hi Perf
14092360 Open 78-90 454
*1 T = Tall Deck Block

Casting # Chamber Years CID & Additional Comments
3804391 Closed 65 396 - 375 and 425HP
3856208 Closed 65-67 396/425hp, 109cc chamber 396/375hp "Z-16" Chevelle
3873858 Closed 65-66 396 & 427 Hi Perf, 109cc chamber
3904391 Closed 65-67 396 & 427 Hi Perf, 107cc chamber
3904392 Closed 67 Aluminum 427 - 430 & 435 HP, 107cc chamber
3919328 Closed 67 Aluminum 427 - 425 & 435 HP
3919391 Closed 66 427 - 425 HP
3919838 Closed 67-69 Aluminum 427 L-88 & L-89
3919839 Closed 67-69 396 & 427 Hi Perf
3919840 Closed 65-69 396 & 427 Hi Perf, 107cc chamber
3919842 Closed 67-69 396 & 427 Aluminum L-88, 107cc chamber
3931068 Closed 66-69 427 Hi Perf
3946074 Open 69-71 69 427 L88, ZL1, Aluminum, 118cc chamber '71 454 LS6, "round exhaust port"
3964291 Closed 69-70 396, 402, 427, 454, 109cc chamber Large or small hex spark plugs used
3964292 Closed 70 454 - 450 HP
3994025 Open 71 454
3994026 Open 71 454 LS-6 - 425 HP, 118cc chamber
3996074 Open 71 454
6258723 Open 71 454 - 425 HP
6272990 Open 70-76 454 service replacement, used on some MKIV crate engines, 118cc chamber
10045427 Open 90- Pontiac/Chevy Aluminum, 91cc chamber Large Port, race
10049875 Open 90- Pontiac/Chevy Aluminum Small port, race
10051128 Open 88 Bowtie, Aluminum 72cc chambers Symmetrical ports
10051129 Open 88 Bowtie, Aluminum "raw" casting, Symmetrical port
12363401 Open 96- Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI, 118cc chamber
12363861 Open 96- Signatures Series, 2ND Design, Raised Port, Aluminum
12562934 Open 00- Gen.VI 502 Marine
14011077 Open 69-71 Aluminum, fits MKIV, "C-port" 118cc chamber, also sold as a "solid" head
14011077 Open 69-71 427 & 454 Solid
14044861 Open 84-96 Bowtie, Aluminum, MkIV, "raised runners", 1st design, 105cc chamber
14044861 96- Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI "raised runners", 2nd design, 115cc chamber
14044861 84-96 Bowtie, Aluminum, MkIV "raw" casting of "861" MKIV 1st design
14044862 84 Aluminum Bowtie Raised Ports, 1ST Design
14096188 Open 70-71 54 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber
14097088 Open 91- 454HO & 502HO Gen V, , 118cc chamber
24502585 97 Olds/Chevy, DRCE 2, Pro Stock aluminum, for blocks w/4.900" bore centers