.

Casting #CIDYearChamberValve SizeNotes

.

3305453507376cc2.02/1.60

.

33388135074 - 7576cc2.02/1.60

.

333882350/40074 - 8076cc

.

340292 70 - ?64ccOver the counter

.

354434262/267/30575 - 7960cc

.

35874130576 - 79

.

37644535077 - 8576ccSmall valve emissions head

.

376450262/267/30575 - 8160cc6 or 7 exhaust bolt holes

.

46261430577 - 7960cc

.

462624350/40075 - 8676cc2.02/1.60Also came with 1.72/1.5 and 1.94/1.50 sized valves

.

45864235075 - 84

.

468642350/40076 - up

.

471513267/35079

.

517513267/35079

.

181688728363Made in "Canada", GMC HD truck

.

363683926555

.

370352326555

.

371335826555 - 56

.

371356926555 - 56

.

372530626556

.

373153928357283HP Fuel Injected

.

373154428357 - 61

.

373155428357 - 62

.

373155628357Truck, Made in Canada

.

373176226556Vette, 2x4 carbs

.

3737775283/32762 - 67

.

3740997283571x4, 2x4 & FI (exc.-283hp)

.

374305628358

.

374309632762 - 67GMC Truck

.

374736328357 - 61

.

3747460283/32759 - 6770cc

.

374877028358

.

374877228358 - 61

.

375553728357 - 62

.

375553928358 - 62

.

375554928357 - 62

.

375555028359

.

375558532762 - 67GMC Truck

.

376746028359 - 60

.

376746232762 - 67

.

376746528359 - 61

.

376775428359 - 6160cc

.

376779228360 - 64

.

3774682283/32760 - 6470cc

.

377468432762 - 6475cc

.

377469228358 - 6460cc

.

378246132764 - 6662ccCamel hump,no accessory holes,160/62cc port volumes

.

3782461X283/32760 - 6362ccCamel hump,no accessory holes,larger 172/64cc port volumes

.

379589628363 - 6560cc

.

379589632762 - 6460cc

.

379899632763 - 67

.

3814480283/32760 - 6770cc1.72/1.50

.

3814482283/327/35062 - 6775cc

.

3817680283/32763 - 67

.

381768132762 - 67

.

3817682283/32761 - 62

.

383683926555

.

3836842283/32757 - 67

.

3837064283/32756 - 62

.

383706526555 - 56Truck

.

384882028357 - 58

.

3876775283/32760 - 6775cc

.

388452028360 - 6760ccMade in Canada, also some marked Studebaker

.

388452032762 - 6760ccMade in Canada, also some marked Studebaker

.

3890462302/327/35066 - 6764ccCamel hump, no accessory holes

.

390106835087 - up64ccCrate motor, 285hp

.

3911032307/3276870cc

.

391226428358 - 62

.

391226528363 - 64

.

391231132765 - 67

.

391231332765 - 67

.

3917290307/32767 - 68

.

39172912302/327/35067 - 6864ccCamel hump, no accessory holes

.

3917292327/3506864ccCamel hump

.

3917293307/32767 - 6875cc

.

3927185307/327/35069 - 7670cc

.

3927186302/35069 - 7064ccCamel hump, accessory holes

.

392718735069 - 7064ccCamel hump, accessory holes

.

39271883276974cc

.

39271883077074cc

.

393163330768 - 73

.

393163535068 - 76

.

393163832768Truck

.

393244135069 - 7076cc

.

3932441X350/40069 -7080cc

.

393245430769 - 73

.

393245435069 - 79Truck

.

394681235069

.

394681335069 - 79Truck

.

394704032768 - 7364ccTruck, angle plugs, good performance head, no accessory holes

.

3947041302/35069 - 7064ccTruck, angle plugs, good performance issue. has accessory holes

.

3947041X350/35069 - 7064ccAngle plugs, 165cc intake port, good performance head, has accessory holes

.

39515984007076cc

.

3964286350

.

396574235070Over the counter, angle plug head

.

3970126327/35067 - 71

.

397337035069 - 7064ccOver the counter in US, canadian 350/300hp production use in Pontiac, straight or angle plug

.

39734143507064ccLT-1 350/370hp, camel hump

.

397348735071 - 7275cc2.02/1.6Was also used on 71' 350/330hp LT-1, also came with 1.94/1.50 valves

.

3932441X35071 - 7275cc2.02/1.6Also came with 1.94/1.5 valves

.

397349340071 - 7276cc

.

39863163507176cc

.

39863363507176cc

.

3986336X3507176cc

.

3986339307/3507174cc

.

3986339X307/3507174cc

.

3986388307/35068 - 76

.

39914923507064ccLT-1 accessory hole, straight plugs

.

399149270 - up64ccOver the counter, camel hump, straight or angle plugs

.

39989163507276cc2.02/1.6Also used with 72' 350 LT-1, screw in studs

.

399892035072 - 73

.

3998991307/35072 - 7375cc

.

3998993307/35072 - 7375cc

.

3998993350current75ccGoodwrench crate engines, Made in Mexico

.

3998997350/40072 - 7376cc

.

3998997305/35078 - 8476cc

.

407926135075

.

1003386762ccAluminum, over the counter Pontiac 23*, angle plug, 196cc intake port

.

1004543455ccOver the counter Pontiac 15*, angle plugs, raised runner, aluminum, "roll over" head

.

1005110155ccBowtie, angle plugs, raised runners and 196cc intake ports

.

1006520235087 - 95Truck

.

1006520335087 - 95Truck

.

1006520435087 - 95

.

1006520530587 - 95

.

1006520635087 - 95

.

1006520730587 - 95

.

1008811335088 - up58cc1.94/1.5Aluminum, angle plugs, raised "D" port exhaust

.

1009332861ccOver the counter Pontiac 15* head, aluminum, 224cc intake ports, "roll over" head

.

1010617835090LT5, ZR1, DOHC 32 Valve, passengers side, aluminum

.

1010617935090LT5, ZR1, DOHC 32 Valve, drivers side, aluminum

.

1011081035091 - up65ccGen 1

.

1012092835087 - 95

.

1012532035094 - 96Gen 2 LT1, cast iron, used on "9C1" Police Package, Impala SS, Cadillac Fleetwood, Buick Roadmaster, reverse flow cooling

.

1012837435092 - up58ccGen 2 LT1, angle plugs, aluminum, reverse flow cooling with 175/68cc ports

.

1013435245ccBowtie, angle plug, "low port", 223cc intake port, aluminum, 18* race head

.

10134363NOTE: 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

.

1014789835095 - 98Gen 1 crate motor

.

1015955035087 - 95

.

1015955130587 - 95

.

1015955235087 - 95

.

1015955330587 - 95

.

1017438935091 - 94LT5, ZR1, DOHC 32 Valve, drivers side, aluminum

.

1017439035091 - 95LT5, ZR1, DOHC 32 Valve, passengers side, aluminum

.

1018504045ccBowtie, aluminum, 1st version, symmetrical ports, 263cc intake ports, splayed valves

.

1018504045ccBowtie, aluminum, 2nd version, symmetrical ports, 240cc intake ports, splayed valves

.

1020524535093Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes

.

1020764335094 - 96Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes

.

1020889026594 - 96Gen.II, L99, 4.3 Liter V-8, cast iron, reverse flow

.

102153393509768ccGen 3 LS1, aluminum

.

1022512135094 - 95LT5, ZR1, DOHC 32 Valve, drivers side, aluminum

.

1022512235095LT5, ZR1, DOHC 32 Valve, passengers side, aluminum

.

1023990235096 - up54.4ccGen 2 LT4, aluminum, reverse flow cooling, 195cc port, angle plug

.

1023990635096 - up64cc1.94/1.5"Vortec 5700", L31, 170cc intake port

.

1236771299 - up62cc2.00/1.55"Fast Burn", aluminum, 210cc intake port

.

1236771399 - up62cc2.00/1.55"Fast Burn", used on ZZ430 crate motor, aluminum, 210cc intake port

.

12480005200038cc2.125/1.625LS1 "GTZ", aluminum, angle plugs

.

1248001197 - up48ccBowtie SB2.2, aluminum, 2nd version of SB2,"Mirror Ports", revised valve angles and plug locations

.

1250645035087 - 95

.

1250985930587 - 94

.

1251685235087 - 95

.

1252974226595 - 96Gen 2, L99, cast Iron

.

1255156135096Gen 2 LT1, aluminum

.

1255252030597 - upVortec, truck

.

1255429035094 - 96Gen 2 LT1, cast iron, used on "9C1" Police Package, Impala SS, Cadillac Fleetwood, Buick Roadmaster, reverse flow cooling

.

1255429126595 - 96Gen 2, L99, cast Iron

.

1255569035096Gen 2, LT4, aluminum

.

1255674332599Gen 3, aluminum, truck, van

.

12558059305971.84/1.5Vortec truck

.

125580623509864cc1.94/1.5L31, vortec, Truck, 170cc intake port

.

1255880635097 - 9868ccGen 3, LS1, aluminum

.

1255985335099 - up68ccGen 3, LS1, aluminum

.

12559862265/32599 - upGen 3, aluminum, 4.8/5.3 liter

.

1255989532500 - upGen 3, aluminum, Vortec 5.3 liter

.

1256170632501 - 045.3 liter, aluminum

.

1256187336499 - 0171ccGen 3, iron

.

1256231736401 - 0471ccGen 3, aluminum

.

1256424135000 - up68ccGen 3, LS1, aluminum

.

12564243350/36401 - upGen 3, LS6, LS2, aluminum

.

1257203536401 - 0471ccGen 3, 6.0L, aluminum

.

1400885626779 - 81

.

1401020130582 - 85

.

1401103464ccBowtie,cast iron, 184cc intake port volume, angle plug, phase 2 head

.

1401104955ccBowtie, aluminum, angle plug, 180cc intake ports, phase 6 head

.

1401108335055 - 8664cc1.94/1.5Crate motor for years indicated, 285/300hp

.

14014415267/30580 - 85

.

1401441630580 - 8658cc1.84/1.5

.

14014440305801.84/1.5

.

1401982135080 - 86

.

1401992426779 - 81

.

1401992635080 - 86

.

1401051635080 - 86

.

1402051735080

.

1402055530581

.

1402055635081

.

1402205635085

.

1402220635080

.

1402230130580 - 86

.

14022601267/30580 - 8653cc1.84/1.5Also came with 1.72/1.5 valves

.

1402280130580 - 86

.

1402481635076cc1.94/1.5Gen 1 crate motors

.

1403480626778 - 82

.

1403480730578 - 86

.

1403480835080 - 86

.

1403480835096 - up76cc1.94/1.5Gen 1 , Goodwrench crate motors

.

1403481035080 - 86Truck

.

1403481135080 - 86Truck

.

1403912130581 - 86Truck

.

1403912230581 - 86Truck

.

1407111435080 - 86

.

1407538135080 - 86Truck

.

1407926135086

.

1408584435080 - 86Truck

.

1408596335086

.

14088526350Gen 32, LT1, aluminum

.

1408911935086 - 88

.

1409409335086 - 88

.

1409621735055 - 8664ccCrate motor, 285hp/300hp, 72' or 90' center intake manifold bolt angles

.

1410108130587 - 95

.

1410108335087 - up64ccGen.I, also used on crate motors, 285 or 300 hp, 72' center manifold bolt angles

.

1410112835086 - 8758ccAluminum, angle plug

.

1410218730587 - 911.84/1.5

.

1410219135087 - up1.94/1.5Swirl port, EFI heads

.

14102193305/35087 - up1.94/1.5Swirl port, EFI heads

.

22542525Dart/Olds/Chevy aluminum, 14'or 17' race head

.

2450255996 - 9738ccBowtie, "SB2", 1st version, "mirror ports", aluminum, 196cc port, CNC version 280cc port,

.

2550014142cc2.1/1.625Buick/Chevy aluminum, 10' race head, symmetrical ports,
235cc intake port volumes

.

25534351C04 - up2.00/1.55Gen.I Bowtie, cast iron Vortec head, 175/65cc ports, "small port head"

.

25534371C04 - up2.00/1.55Gen.I Bowtie, cast iron Vortec head, 206/77cc ports, "large port head"

.

3341736935090 - up76ccGen.I Goodwrench crate motor, made in Mexico