CHEVY V-8 CRANKSHAFT CASTING No.

1130………….327…………..forged…medium journal……… 3.25″ stroke
1178………….302…………..forged…medium journal……… 3.00″ stroke
1181………….305,350………cast…..medium journal……… 3.48″ stroke
1182………….350…………..forged…medium journal……… 3.48″ stroke
2680………….327…………..forged…small journal…………. 3.25″ stroke
2690………….350…………..forged…medium journal……… 3.48″ stroke
3279………….302…………..forged…medium journal……… 3.00″ stroke
4577………….327…………..forged…small journal…………. 3.25″ stroke
4672………….327…………..forged…medium journal……… 3.25″ stroke
310514………350……………cast……medium journal……… 3.48″ stroke
330550………350……………cast……medium journal……… 3.48″ stroke
354431………262……………cast……medium journal……… 3.10″ stroke
3727449…….283……………forged…small journal…………. 3.00″ stroke
3729449…….265……………forged…small journal…………. 3.00″ stroke
3734627…….327……………forged…small journal…………. 3.25″ stroke
3735236…….265,283………forged…small journal…………. 3.00″ stroke
3735263…….283……………forged…small journal…………. 3.00″ stroke
3782680…….327……………forged…small journal…………. 3.25″ stroke
3814671…….327……………forged…small journal…………. 3.25″ stroke
3815822…….265,283,302…forged…small journal………… 3.00″ stroke
3835236…….283……………forged…small journal…………. 3.00″ stroke
3836266…….283……………forged…small journal…………. 3.00″ stroke
3848847…….283……………forged or cast..sm. journal….. 3.00″ stroke
3849847…….283……………forged…small journal…………. 3.00″ stroke
3876764…….283……………forged or cast..sm. journal….. 3.00″ stroke
3876768…….283……………forged…small journal…………. 3.00″ stroke
3884577…….327……………forged…small journal…………. 3.25″ stroke
3892690…….350……………forged…medium journal……… 3.48″ stroke
3911001…….307,327………cast……medium journal……… 3.25″ stroke
3911011…….307,327………cast……medium journal……… 3.25″ stroke
3914672…….327……………forged…medium journal……… 3.25″ stroke
3923279…….302……………forged…medium journal……… 3.00″ stroke
3932442…….267,305,350…cast……medium journal……… 3.48″ stroke
3941174…….307,327………cast……medium journal……… 3.25″ stroke
3941178…….302……………forged…medium journal……… 3.00″ stroke
3941182…….350……………forged…medium journal……… 3.48″ stroke
3941188…….350……………forged…medium journal……… 3.48″ stroke
3949847…….283……………forged or cast..sm. journal…… 3.00″ stroke
3951130…….327……………forged…medium journal……… 3.25″ stroke
3951529…….400……………cast…….large journal…………. 3.75″ stroke

SBC ONE PIECE REAR MAIN OIL SEAL

10168568…265…….cast….medium journal…3.00″ stroke
14088526…305,350…cast….medium journal…3.48″ stroke
14088532…350…….forged..medium journal…3.48″ stroke
14088535…305,350…cast….medium journal…3.48″ stroke
14088552…350…….forged..medium journal…3.48″ stroke

ZR1, “LT5”, 350 DOHC

10106122…350…….forged..large 2.76″ journal…3.66″ stroke

BBC TWO PIECE REAR MAIN OIL SEALS
3.76″ STROKE used on ’65-’90 Mark IV 366T, 396, 402, 427 or 427T

6223…….396,402,427…forged, 1053 steel
7115…….396,402,427…forged, nitrided, cross-drilled, 5140 steel
3804816….396,402,427…cast
3856223….396…forged
3863114….402…
3863144….396,402…
3874874….396,402…
3879621….427…forged
3882841….396…forged, cross drilled, nitrided
3882842….427…forged, cross drilled, nitrided
3882847….
3882848….
3882849….427…forged
3887114….396…forged, nitrided, 5140 steel
3904815….396,402…cast, nodular iron
3941180…
3942411….
3965746……….semi finished, forged
3993804……….raw, 5140 steel

BBC ONE PIECE REAR MAIN OIL SEAL
3.76″ STROKE used on ’91-up Gen.V and Gen. VI 366T, 427T

10114186…427T…forged, 1053 steel
10114187…366T…cast

TWO PIECE REAR MAIN OIL SEALS
4.00″ STROKE used on ’70-90 Mark IV 454 or Mark IV 502

3520…….454…forged, cross-drilled, 1053 steel
3521…….454, 502…forged, cross-drilled, 5140 steel
3524…….454…forged
7416…….454, 502…forged, cross-drilled, 1053 steel
7463…….454…forged
336782…..454…cast
353039…..454…cast
353638…..454…
359730…..454…
3962523….454…forged
3963523….454…
3963524….454…forged
3967416….454…forged
3967463….454…forged
3975945….454
3963521….454…forged, cross drilled, 5140 steel
3965753……….semi finished, forged, 5140 steel
3975495….454
3993878….454…forged
10051169…454…forged raw casting

ONE PIECE REAR MAIN OIL SEAL
4.00″ STROKE used on ’91-up Gen.V and VI 454 or 502

10114188…454……cast
14097044…454,502..forged, 1053 steel

CHEVY 348-409 “W” MOTOR V-8 Crankshaft Casting Numbers

3732692…348…forged…3.25″ stroke
3733223…348…forged…3.25″ stroke
3733226…348…forged…3.25″ stroke
3741640…348…forged…3.25″ stroke
3741642…348…forged…3.25″ stroke
3788072…409…forged…3.50″ stroke
3795589…409…forged…3.50″ stroke
3815822…348…forged…3.25″ stroke
3824553…348…forged…3.25″ stroke
3829027…409…forged…3.50″ stroke
3837466…409,427 “Z11″…forged…3.65” stroke
3838416…409…forged…3.50″ stroke

CHEVY V-8 CASTING NUMBERS
SMALLBLOCK V-8 CASTING NUMBERS
SBC BLOCKS

CASTING#…..SIZE…YEAR…MAIN CAP BOLTS….NOTES

140029…..350…80-84…2
330817…..400…72-80…2
355909…..262…..75….2
355909…..305…76-79…2
360851…..262…75-76…2…Monza V-8
361979…..305…78-79…2
366245…..350…78-79…2
366286……………….4…Bowtie, Aluminum, siamesed,
straight nodular iron main
caps, 2-piece seal, 4.00-4.150″
bores, 2.45″ main journals
366287……………….4…Bowtie, Aluminum, siamesed,
straight nodular iron main
caps, 2-piece seal, 4.00-4.150″
bores, 2.45″ main journals
366299……………….4…Bowtie, Aluminum, nodular
iron splayed caps, wet sump,
4.00″ bore
389257…..302…..67….2
393288…..283…65-67…2
460703…..350…..78….4
460776…..305…78-79…2
460777…..305…78-79…2
460778…..305…78-79…2
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
3731548….283…57……2…No side motor mounts
3737739….283…58-64…2
3756519….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 recessed oil filter boss
3790721….327…65-66…2…Chevy II recessed oil filter boss
3791362….327…62-67…2…Chevy II recessed oil filter boss
3792563….327…..65….2
3792582….283…64-65…2
3794226….283…58-63…2
3794460….327…62-64…2
3814660….327…68-69…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 recessed oil filter boss
3862812….283…62-64…2
3892657….302…..67….2…Z-28 Camaro
3892657….327…..67….2
3892657….350…..67….2…Camaro
3896944….283…..67….2
3896948….283…66-67…2
3903352….327…..67….2
3914636….307…..68….2
3914653….307…68-73…2
3914660….327…..68….2
3914678….302…..68….2…Z-28 Camaro
3914678….327…..68….2
3914678….350…..68….2
3932371….307…69-73…2
3932373….307…68-73…2
3932386….302…..69….4…Z-28 Camaro
3932386….327…..69….2
3932386….350…..69….4
3932388….350…..69….2 or 4
3951509….400…70-71…4
3951509….400…74-80…2
3951511….400…70-72…4…Some replacement blocks had 2-bolt main caps
3956618….302…..69….4…Z-28 Camaro
3956618….327…68-69…2
3956618….350…..69….2 or 4
3956632….307…..69….2
3959512….327…..67….2…May have been used for some replacement blocks
3970010….302…..69….4…Z-28 Camaro
3970010….350…69-80…2 or 4
3970014….350…70-75…2 or 4
3970020….307…70-73…2
3970024….307…69-73…2
4715111….305…..80….2
6259425….350…69-76…2
10036033…350………..4…Goodwrench crate motor, 2-piece rear
seal, “Hecho en Mexico”
10051182……………..2 or 4…Bowtie, 3.75″-4.30″ bores, 1 or 2-piece rear seal
10051184……………..4…Bowtie, 4.00″-4.155″ bores, 1 or 2-piece rear seal
10054727…350…86-up…2 or 4…one piece rear seal, some “Made in Canada”
10066036…350………..2 or 4…Target Master/Goodwrench crate motor, 2-piece rear
seal, “Hecho en Mexico”
10066038…350…..94….4…Goodwrench crate motor, 2-piece rear
seal, “Hecho en Mexico”
10090511…350…..90….2…LT-5, ZR1 Vette, 375hp
10125327…350…92-up…2 or 4…Gen.II LT-1, reverse flow cooling
10125327…350…96-up…2 or 4…Gen.II LT-4, reverse flow cooling
10134996……………..4…Bowtie, Aluminum, 4.125″ bore
2.65″ main journals
10153558…350…91-92…4…LT-5, ZR1 Vette, 375hp
10168588…265…94-96…2…L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling
10199001…350…93-95…4…LT-5, ZR1 Vette, 405hp
10243878…305…96-97…2…Vortec truck, roller cam, one-piece rear seal
10243880…350…95-99…4…Gen.I crate motors and “ZZ4”, roller cam, one piece rear seal
12550592…350…97-up…crossbolted block, Gen.III, “LS1”
12559846…350…98-up…crossbolted block, Gen.III, “LS1”
12560621…350…98-up…crossbolted block, Gen.III, “LS1”
12562174…350…98-up…crossbolted block, Gen.III, “LS1”
14010201…305…80-84…2
14010202…305…80-84…2
14010203…305…80-85…2
14010207…350…80-85…2 or 4
14010209…350…80-85…4
14010280…267…79-82…2
14011064…350…83……4
14011148…350…87-89…….Roller cam, one-piece rear seal
14016376…267…79-82…2
14016379…350…77-79…2 or 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, one-piece rear seal
14088548…350…86-88…2 or 4
14088551…305…86-87…2…one-piece rear main seal
14093627…305…87-91…2…Roller cam, one-piece rear seal
14093638…350…87-95…2 or 4…Roller or flat tappet cam
one-piece rear seal
14094766…305…86-up…2…One-piece rear seal
14101148…350…87-90…4…One-piece rear seal
14102058…305…87-91…2…Roller cam, one-piece rear seal
22551656……………..4…Rocket block, 4.00″-4.190″ bores, 2.45″ main
journal sizes, splayed caps, dry sump,
2-piece rear seal, 9.025″ deck

SBC HEADS

330545…..73……350……….76cc, 2.02/1.60
333881…..74-75…350……….76cc, 2.02/1.60
333882…..74-80…350/400……76cc
340292…..70’s…….Over şŸe counter, angle plug, 64cc
354434…..75-79…262/267/305
358741…..76-79…305
376450…..75-81…262/267/305..6 or 7 exhaust bolt holes
376455…..77-85…350
462624…..75-86…350/400……76cc chamber
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, 2×4 carbs
3737775….62-67…283/327
3740997….57……283……….1×4, 2×4 & FI (exc.-283hp)
3743056….58……283
3743096….62-67…327……….GMC Truck
3747363….57-61…283
3747460….59-67…283/327
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
3767462….62-67…327
3767465….59-61…283
3767754….59-61…283
3767792….60-64…283
3770126….69……327
3774682….60-64…283/327
3774684….62-64…327
3774692….58-64…283
3782461….64-66…327……….camel hump, no accessory holes
, 160/62cc port volumes
3782461X…60-63…283/327……camel hump, no accessory holes,
slightly larger 172/64cc port volumes
3795896….63-65…283
3795896….62-64…327
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
3884520….66-67…283……….Some marked “Made in Canada”,
60cc chamber, also used by
Studebaker
3890462….66-67…302/327/350..Camel hump, no accessory holes
3901068….87-up…350……….Crate motor, 285hp, 64cc chamber
3911032….68……307/327
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
3917292….68……327/350……Camel hump
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 şŸe counter, angle plug
3970126….67-70…327/350
3973370….69-70…350……….over şŸe counter, 64cc, straight or angle plug
3973414….70……350……….LT1-370hp, Camel hump, 64cc
3973487….71-72…350……….used on 71-72 350 LT1, 75cc
3973487X…71-72…350……….75cc
3973493….71……400……….76cc
3986316….71……350……….76cc
3986336X………..350……….76cc
3986388….68-76…307/350
3986339….71……307/350……74cc
3986339X…71……307/350……74cc
3991492….70……350……….LT1, Camel hump, accessory holes
64cc, straight plugs
3991492….70-up…………….over şŸe counter, Camel hump,
64cc, straight or angle plugs
3998916….72……350……….also used w/’72 350 LT1,
big valves, screw in studs
3998920….72-73…350
3998991….72-73…307/350……75cc
3998993….72-73…307/350……75cc
3998993….current..350………Goodwrench crate motors,
“Hecho en Mexico”
3998997….72-73…350/400……76cc
3998997….78-84…305/350……76cc
4079261….75……350
10033867……………………Over şŸe counter Pontiac 23′ head
62cc, angle plug, 196cc intake
port, aluminum
10045434……………………Over şŸe 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 şŸe 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…93-up…350……….Gen. 1
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 şŸis
aluminum 18′ and 15′ Bowtie race head.
Different chamber volumes, port
volumes, port locations, valve sizes,
etc. were used. Check şŸis casting
carefully to determine which features
it may have. There are at least 6
different versions as of 11/99.
10147898…95-96…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
12558059…97……305……….Vortec, truck, 1.84″/1.5″ valves, 64cc chamber
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……350……….Gen.III, “LS1”, aluminum, 68cc
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……1.84″/1.5″ valves, 58cc 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
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…350
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
33417369…90-up…350……….Gen.I Goodwrench crate motor,
“Hecho en Mexico”, 76cc

CHEVY BIG BLOCK V-8 CASTING NUMBERS
BBC BLOCKS

340220…..427T……68-85…4-bolt
345014…..454…….70-86…
346236…..454…….75-76…2-bolt
359070…..454…….70-90…
361959…..454…….73-90…2 or 4 bolt
364776…..427T……68-85…4-bolt
364779…..366T……68-90…4-bolt
399204…..509…….70-71…4-bolt, Alum., CanAm, 4.5″ bores, Cylinder liners
399289…..454…….73-79
399293…..366T……77-78…4-bolt
473478…..427T……77-90…4-bolt
3782870….427T……68-76…4-bolt
3824553….366T……66-67…4-bolt
3855961….396…….65-66…2-bolt
3855961….427…….66……2-bolt
3855962….396…….65-66…4-bolt
3855977….366T……66-73…4-bolt
3869942….427…….66-67…2 or 4 bolt
3902406….396…….67……2 or 4 bolt
3904351….427…….67……2 or 4 bolt
3904354….366T……66-76…4-bolt
3916319….366T……68……4-bolt
3916321….427…….68……2 or 4 bolt
3916323….396…….68……2 or 4 bolt
3925521….366T……68-85…4-bolt
3935439….427…….68-69…2 or 4 bolt
3935440….396…….68-69…2 or 4 bolt
3937724….366T……68-85…4-bolt
3937726….427T……68-84…4-bolt
3946052….427…….69……4-bolt, Alum. ZL-1
3946053….427…….97……4-bolt, Alum. ZL-1, 2nd version
3955270….427…….69……2 or 4 bolt
3955272….396…….69……2 or 4 bolt
3955274….366T……68-85…4-bolt
3955276….427T……68-73…4-bolt
3963512….427…….69……2 or 4 bolt
3963512….454…….70-76…2 or 4 bolt
3969854….396…….69……2 or 4 bolt
3969854….402…….70-72…2 or 4 bolt
3969858….427T……68-84…4-bolt
3999289….454…….72-79…2-bolt
3999290….396…….68-69…2 or 4 bolt, Truck
3999290….402…….70-72…2 or 4 bolt, Truck
3999290….402…….72……2 or 4 bolt, Passenger
3999293….366T……68-90…4-bolt
3999294….427T……68-84…4-bolt
10051107…454……………4-bolt, Bowtie, MkIV, Short deck, CNC prep, 4.25″ bore
10068286…454…….90
10114182…454…….91-up…Gen.V, 4-bolt
10114183…366T……91-up…Gen.V, 4-bolt
10114184…427T……91-up…Gen.V, 4-bolt
10134366…454T…………..4-bolt, Bowtie, Gen.V, Tall deck
10185050…454……………4-bolt, Bowtie, Gen.V, Short deck
10237297…454…….96-up…4-bolt, Vortec 7400″, “L-29”
10237300…502…….96-up…4-bolt, Gen.VI, 4.466″ bore
12550313…454…….91-up…4-bolt, Gen.V crate motor, Gen. VI 4.25″ bare block, fuel pump boss
14015443…454…….87-90…4-bolt, MkIV Truck, Motorhome
14015445…454…….78-90…2 or 4 bolt
14044807…454T…………..4-bolt, Bowtie, MkIV, Tall deck, 4.25″ bore or 4.500″ bores
14096859…502……………4-bolt, Gen.V, HO
24502504…454……………4-bolt, Bowtie, Gen.V, Race prep, 9.8 “short” deck height
24502506…454T…………..4-bolt, Bowtie, Gen.V, Race prep, 10.2 “tall” deck height
24502572…………………4-bolt, 4.5″ bore Olds DRCE 2,
9.5″ deck height
T = Tall deck

BBC HEADS

330864…..68-84…oval…OPEN…396, 402, 366T,
427T, 454 Truck
330865…..68-84…oval…OPEN…396, 402, 366T,
427T, 454 Truck
330866…..68-78…oval…OPEN…366T, 427T
330867…..68-73…oval…OPEN…427T
336765…..68-78…oval…OPEN…427T
336768…..73-76…oval…OPEN…427T
336781…..73-85…oval…OPEN…454
343771…..68-86…oval…OPEN…366T, 427T, 454
343772…..68-86…oval…OPEN…366T, 427T, 454
343783…..70-76…oval…OPEN…454 Truck
346236…..75-87…oval…OPEN…454
352625…..70-76…oval…OPEN…454 Truck
353049…..73-84…oval…OPEN…454
366765…..74-78…oval…OPEN…427T
386781…..73-79…oval…OPEN…454
473328…..68-69…oval…OPEN…366T
3856206….65-66…oval..CLOSED..396
3856208….65……rect..CLOSED..396/425hp
396/375hp “Z-16” Chevelle
3856213….66-82…oval..CLOSED..366T, 427T
3856260….68……oval..CLOSED..396 Truck
3872702….65-66…oval..CLOSED..396, 427
3873858….65-67…rect..CLOSED..396, 427
3876875….77-85…oval…OPEN…427T
3904390….67……oval..CLOSED..396, 427
3904391….67……rect..CLOSED..396, 427
3904392….67……rect..CLOSED..427 Aluminum, L88, L89
3904393….68-76…oval…OPEN…366T
3909802….67……oval..CLOSED..396, 427
3917215….67-68…oval..CLOSED..396, 427
3917219….68-85…oval…OPEN…366T, 427T
3919840….67-69…rect..CLOSED..396, 427
3919842….68-69…rect..CLOSED..396, 427, Aluminum L88, L89
3931063….68-69…oval..CLOSED..396, 402, 427
3933148….69-84…oval…OPEN…’69 396/265hp, 366T, 427T
3933149….68-76…oval…OPEN…427T
3935401….68-76…oval…OPEN…427T
3946074….69&71…rect…OPEN…’69 427 L88, ZL1, Aluminum
’71 454 LS6, “round exhaust port”
3964290….69-70…oval..CLOSED..396, 402, 427, 454
Large or small hex spark
plugs used
3964291….69-70…rect..CLOSED..396, 402, 427, 454
Large or small hex spark
plugs used
3965198….68-69…oval..CLOSED..396 Truck
3975950….68-70…oval…OPEN…396, 402 Truck, 366T, 427T
3986133….68-85…oval…OPEN…366T, 427T, 454 Truck
3986135….69-73…oval…OPEN…366T, 427T
3986136….68-84…oval…OPEN…366T, 427T, 454 Truck
3993820….71-84…oval…OPEN…402
3993820….71-84…oval…OPEN…454 Truck
3994026….71……rect…OPEN…454 LS6
3999241….72……oval…OPEN…402, 454
6272292….70-78…oval…OPEN…402, 454
6272990….70-up…rect…OPEN…454 service replacement, used on some MKIV crate engines
10045427………..rect……….Pontiac/Chevy Aluminum
Large Port, race
10049875………..rect……….Pontiac/Chevy Aluminum
Small port, race
10051128………..rect……….Bowtie, Aluminum 68cc chambers
Symmetrical ports
10051129………..rect……….Bowtie, Aluminum “raw”
casting, Symmetrical ports
10052902………..oval…OPEN…MkIV, 427T
10101140…91-up…oval..CLOSED..Gen.V 366T, 427T
10114156…94-up…oval…OPEN…Gen.V & VI 454
10141279…96-up…oval..CLOSED..”Vortec 7400″, 100cc chambers
10487052…77-90…oval…OPEN…366T
12363391…96-up…oval…OPEN…Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
12363401…96-up…rect…OPEN…Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
12363425…96-up…rect……….Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
“raised runners”, 2nd design “861”
12363861…84-96…rect……….Bowtie, Aluminum, MkIV,
“raised runners”, 1st design
12363861…96-up…rect……….Bowtie, Aluminum, Signature
Series, fits MKIV, Gen.V, Gen.VI
“raised runners”, 2nd design
12363862…84-96…rect……….Bowtie, Aluminum, MkIV
“raw” casting of “861” MKIV
1st design
14011077…69-up…rect…OPEN…Aluminum, fits MKIV, “C-port”
also sold as a “solid” head
14081045…78-87…oval…OPEN…454
14081052…85-87…oval…OPEN…366T, 427T, 454 Truck, Marked “HiPerf”
14092359…86-90…oval…OPEN…366T, 427T, Marked “HiPerf”
14092360…86-88…oval…OPEN…454 Truck
14096188…70-71…rect…OPEN…454 service replacement
14097088…91-up…rect…OPEN…Gen.V 454/502 HO
24502585…97……rect……….Olds/Chevy, DRCE 2,
Pro Stock aluminum, for blocks w/4.900″ bore centers
T = Tall deck

CHEVY “W” MOTOR 348-409 V-8 CASTING NUMBERS
348-409 BLOCKS

3732755…..348……59-61
3732811…..348……58
3751872…..348……58
3755011…..348……59-61
3771705…..348……59-61
3782012…..348……58-61
3788068…..409……62-63
3795623…..409……61
3798962…..348……62-65…Truck
3815707…..348……58-61
3830814…..427……63……”Z11″ (4.312″ bore x 3.65″ stroke)
3830814…..409……63-64
3839752…..409……62-63
3839754…..409……65
3844422…..409……64-65
3857655…..348……62-65…Truck
3857656…..409……64-65
3860386…..409……62-64
3860387…..348……58

348-409 HEADS

3732791…..348……58-60
3758379…..348……59-60…250 hp
3759256…..348……58
3759332…..348……58-60
3764702…..348……60……Truck
3767738…..348……59-60…250 hp
3781147…..348……60-61…HiPerf, 2.06″/1.72″ valves
3795586…..348/409..61……HiPerf, 2.06″/1.72″ valves
3814690…..409……62-63…HiPerf, 2.19″/1.72″ valves
3819333…..348/409..62-65…HD Truck
3830817…..409……63-65…340 hp
3837731…..427……63……”Z11″ (4.312″ bore x 3.65″ stroke)
3852583…..409……63-65…HiPerf, 2.19″/1.72″ valves

CHEVY V-8 BORE AND STROKE LIST
CHEVY SMALLBLOCK V-8 BORE AND STROKE LIST

262 = 3.671″ x 3.10″ (5.7″ rod)
265 = 3.750″ x 3.00″ (’55-’57 Gen.I 5.7″ rod)
265 = 3.750″ x 3.00″ (’94-’96 Gen.II 4.3 liter V-8 “L99″ 5.94” rod)
267 = 3.500″ x 3.48″ (5.7″ rod)
283 = 3.875″ x 3.00″ (5.7″ rod)
293 = 3.780″ x 3.27″ (’99-later “LR4” 4.8 Liter Vortec)
302 = 4.000″ x 3.00″ (5.7″ rod)
305 = 3.740″ x 3.48″ (5.7″ rod)
307 = 3.875″ x 3.25″ (5.7″ rod)
325 = 3.780″ x 3.62″ (’99-later “LM7” 5.3 Liter Vortec)
327 = 4.000″ x 3.25″ (5.7″ rod)
350 = 4.000″ x 3.48″ (5.7″ rod)
350 = 4.000″ x 3.48″ (’96-’00 Vortec, 5.7″ rod)
350 = 3.900″ x 3.66″ (’89-’95 “LT5” in “ZR1” Corvette 32-valve DOHC)
(5.74″ rod)
350 = 3.900″ x 3.62″ (’97-later Gen.III “LS1″)(6.098” rod)