Chevrolet Small Block Casting Numbers

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Caveat: It should be noted that many of the casting numbers are not 100% verified and a second source is not always available so these should not be taken at face value.

Cylinder Block
Casting No. CID Year(s) Main Caps Notes
140029 350 80-84 2  
330817 262 75 2  
355909 262 75 2  
355909 305 76-79 2  
360851 262 75-76 2 Monza V8
361979 305 77-79 2 & 4 Some Canadian H.D. blocks have 4-bolt mains
366245 350 78-79 4 Bowtie
366286     4 Bowtie, Siamese, straight nodular iron main caps, 2-piece seal 4.00-4.150-inch bores, 2.45-inch main journals
366298     4 Bowtie, aluminum, billet main caps, 3.398-inch bore w/sleeves, 2-piece rear main
366299     4 Bowtie, aluminum, nodular iron splayed caps, wet sump, 4.00-inch bore
389257 302 67 2 Z28 Camaro
393288 283 65-67 2  
460703 350 78 4  
460776 305 78-79 2  
460777 305 78-79 2  
460778 305 78-79 2 & 4 Some Canadian H.D. blocks have 4-bolt mains
471511 267 79-82 2  
3556519 283 58-61 2  
3703524 265 55 2 No oil filter
3720991 265 56-57 2  
3731548 265 57 2 No side motor mounts
3737739 283 58-64 2  
5756519 283 58-62 2  
3782870 327 62-67 2  
3789817 283 62-64 2  
3789817 327 62-67 2  
3789935 283 61-64 2  
3790721 283 62-64 2 Chevy II/Nova with recessed oil filter boss
3790721 327 65-66 2 Chevy II/Nova with recessed oil filter boss
3791362 327 62-67 2 Chevy II/Nova with recessed oil filter boss
3792563 327 65 2  
3792582 283 64-65 2  
3794226 283 58-63 2  
3830944 327 63 2  
3794460 327 62-64 2  
3830944 327 63 2  
3834810 283 64-66- 2  
3834812 283 62-63 2  
3837739 283 58-62 2  
3849852 283 57-66 2  
3849935 283 65-67 2  
3858174 327 64-67 2  
3858180 327 64-67 2  
3858618 350 68-76 2  
3862194 283 65-67 2 Chevy II/Nova with recessed oil filter boss
3862812 283 62-64 2  
3892657 302 67 2 Z28 Camaro
3892657 327 67 2  
3892657 350 67 2 Camaro only
3896944 283 66-67 2  
3896948 283 66-67 2  
3903352 327 67 2  
3914636 307 68 2  
3914638 307 68 2  
3914653 307 68-73 2  
3914660 327 68 2  
3914678 302 68 2 Z28 Camaro
3914678 327 68 2  
3914678 350 68 2  
3931174 307 68 2 Truck
3932371 307 69-73 2  
3932373 307 68-73 2  
3932386 302 69 4 Z28 Camaro
3932386 327 69 2  
3932386 350 69 2 & 4  
3932388 327 69 2  
3932388 350 69 2 & 4  
3933180 327 68-69 2  
3951509 400 70-71 4  
3951509 400 74-80 2  
3951511 400 70-73 4 Some replacement blocks had 2-bolt mains
3956618 302 69 4 Z28 Camaro
3956618 327 68-69 2  
3956615 350 69 2 & 4  
3956632 307 69 2  
3959512 327 62-67 2 Also used for CE warranty
3959532 283 64 2 Also used for CE warranty
3959538 327   2 Chevy II/Nova with recessed oil filter boss & also used for CE warranty
3970010 302 69 4 Z28 Camaro
3970010 327 69 2 Trucks & industrial
3970010 350 69-80 2 & 4  
3970014 350 70-76 2 & 4  
3970020 307 69-73 2  
3970024 307 69-73 2  
4715111 305 80 2  
6259425 350 69-76 2  
10036033 350   4 Goodwrench crate motor, 2-piece rear main seal, "Hecho en Mexico" casting.
10046164 305 86 2  
10049804     4 Aluminum, Pontiac Super Duty version of Gen I, 4.00-inch bore, 2-piece rear main seal, splayed caps, GTP race block
10051182     2 & 4 Bowtie, 3.75-4.30-inch bores, 1- or 2-piece rear main seal
10051184     4 4.00-4.155-inch bores,  1- or 2-piece rear main seal
10054727 350 86 > 2 & 4 1-piece rear main seal, some cast with "Made in Canada"
10066036 350   2 & 4 Target Master/Goodwrench crate motor, 2-piece rear main seal, "Hecho en Mexico" casting.
10066038 350 92 4 Goodwrench crate motor, 2-piece rear main seal, "Hecho en Mexico" casting.
10090511 350 90 2 LT-5, ZR1 Corvette, 375hp
10125327 350 92 > 2 & 4 Gen II LT-1, reverse coolant flow
10125327 350 96 > 2 & 4 Gen II LT-4, reverse coolant flow
10134398     4 Bowtie, aluminum, 4.125-inch bore, 2.65-inch main journals
10134996     4 Bowtie, aluminum, 4.125-inch bore, 2.65-inch main journals
10153558 350 91-92 4 LT-5, ZR1 Corvette, 375hp
10168588 265 64-96 2 L99, Gen II, 4.3 Liter V8, Caprice, reverse coolant flow
10199001 350 93-95 4 LT-5, ZR1 Corvette, 405hp
10243878 305 96-98 2 Vortec truck, roller cam, 1-piece rear main seal
10243880 305 96-98 2 Vortec truck, Gen I crate motors, ZZ4, roller cam, 1-piece rear main seal
12550592 350 97 >   Crossbolted block, Gen III, LS1, aluminum
12551358   99 >   Gen III, 4.8L or 5.3L, cast iron, truck
12551364 364 98-04   Crossbolted block, Gen II, 6.0L, truck
12559378 350 99 >   Crossbolted block, Gen III, LS1, aluminum
12559846 350 98 >   Crossbolted block, Gen III, LS1, aluminum
12560621 350 98 >   Crossbolted block, Gen III, LS1, aluminum
12560636 350 99 >   Crossbolted block, Gen III, LS1, aluminum
12560639 350 99   Crossbolted block, Gen III, LS1, aluminum
12561168 350 01 >   Crossbolted block, Gen III, LS1, aluminum
12562174 350 98 >   Crossbolted block, Gen III, LS1, aluminum
12568952 364 05 >   Crossbolted block, Gen III, L.0L, aluminum, LS2
12566940 325 04 >   Crossbolted block, Gen II, 5.3L, aluminum, SSR truck
12571048 325 04 >   Crossbolted block, Gen III, 5.3L
12573581 364 98-04   Crossbolted cast iron, Gen III, 6.0L truck
12577184 364 98-04   Crossbolted cast iron, Gen III, 6.0L truck
12577396   02 >   Gen III, 4.8L or 5.3L, cast iron, truck
14100201 305 80-85 2  
14010202 305 80-85 2  
14010203 305 80-85 2  
14010207 350 80-85 2 & 4  
14010209 350 80-85 2 & 4  
04010280 367 79-82 2  
14011064 350 83 4  
14011148 350 87-89   Roller cam, 1-piece rear main seal
14016376 367 79-82 2  
14016379 350 77-79 2 & 4  
14016381 305 80-84 2  
14016382 305 79-84 2  
14016383 305 80-85 2 Truck
14079287 350 86-90   Truck
14088526 350 87-89   Roller Cam, 1-piece rear main seal
14088548 350 86-88 2 & 4  
14088551 305 86-87 2 1-piece rear main seal
14093627 305 87-94 2 Roller or flat tappet cam, 1-piece rear main seal
14093638 350 87-95 2 & 4 Roller or flat tappet cam, 1-piece rear main seal
14094766 305 86 > 2 1-piece rear main seal
14101147 305 85 > 2  
14101148 305 86-90 4 1-piece rear main seal
14102058 305 87-91 2 Roller cam, 1-piece rear main seal
22551656     4 Chevy/Olds Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump, 2-piece rear seal, 9.025" deck
22551660     4 Chevy/Olds Rocket block, 4.00"-4.190" bores, 400 mains journal sizes, splayed steel caps, wet sump, raised cam 2-piece rear seal, 9.300" deck
         
Cylinder Heads
Casting Year(s) CID Notes
330545 73 350 76cc chambers, 2.02/1.60
333881 74-75 350 76cc chambers, 2.02/1.60
333882 74-80 350/400 76cc chambers
340292 70's   64cc chambers, over the counter angle plug
354434 75-79 262/267/305 60cc chambers
358741 76-79 305  
376445 77-85 350  
376450 75-81 262/267/305 60cc chambers, 6 or 7 exhaust bolt holes
462614 77-79 305 60cc chambers
462624 75-86 350/400 76cc chambers, 1.72/1.5, 1.94/1.5, or 2.02/1.6 valve size
468642 76 > 350/400  
471513 79 267/350  
517513 79 267/350  
1816887 63 283 Cast with "Canada," truck
3636839 55 265  
3703523 55 265 67.4242cc chambers
3713358 55-56 265  
3725306 56 265 55.6685cc chambers, "Power Pak" heads
3731539 57 283 60.1122cc chambers, "Power Pak" and FI
3731544 57-61 283  
3731554 57-62 265/283  
3731556 57 283 Cast with "Canada," truck
3731762 56 265 56.6685cc chambers, Corvette, 2x4
3737775 62-67 283/327  
3740997 57 283 55.6685cc chambers
3743056 58 283 55.6685cc chambers
3743096 62-67 327 GMC truck
3747363 57-61 283  
3747460 59-67 283/327 70cc chambers
3848770 58 283 59.669cc chambers
3748772 58-61 283 69.369cc chambers
3755537 57-62 283 69.369cc chambers
3755549 59 283 69.369cc chambers
3755550 59 283 69.369cc chambers
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 62.076cc chambers. double hump casting
3782461X 60-63 283/327 62.076cc chambers. double hump casting
        

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....67-68...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..........LT1-350/370hp, Camel hump, 64cc chamber
3973487....71-72...350..........1.94/1.5 or 2.02/1.6 valves, was also used on '71 350/330hp LT1, 75cc chamber
3973487X...71-72...350..........1.94/1.5 or 2.02/1.6 valves, 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
12529742...95-96...265..........Gen.II, "L99", cast iron
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
12554291...95-96...265..........Gen.II, "L99", cast iron
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
12559862...99-00................Gen.III, aluminum 4.8/5.3L
12559895...00-up...325..........Gen.III, aluminum, Vortec 5.3L
12561706...01-04................Gen.III, 5.3L, aluminum
12561873...99-01...364..........Gen.III, 71cc, iron
12562317...01-04...364..........Gen.III, 71cc, aluminum
12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc
12564243...01-up...350/364......Gen.III, "LS6", "LS2", aluminum
12572035...01-04...364..........Gen.III, 6.0L, aluminum, 71cc
14008856...79-81...267
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
22542525........................Dart/Olds/Chevy aluminum, 14'or 17' race head.
24502559...96-97................Bowtie, "SB2", 1st version,
                                "mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber
25500141........................Buick/Chevy aluminum, 10' race 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