Casting Number

Year

Port Size

Chamber Size

C.I.D.

Notes

330545

73

 2.02/1.60

76cc

350

333881

74-75

 2.02/1.60

76cc

350

333882

74-80

76cc

350/400

340292

70's

64cc

 angle plug, over the counter

354434

75-79

60cc

262/267/305

358741

76-79

305

376445

77-85

 small valves

76cc

350

376450

75-81

60cc

262/267/305

6 or 7 exhaust bolt holes

462614

77-79

60cc

305

462624

75-86

�1.72/1.5�, �194/1.5�, �2.02/1.6�

76cc

350/400

458642

75-84

350

468642

76-up

350/400

471513

79

267/350

517513

79

267/350

1816887

63

283

Made in "Canada" GMC Truck

3636839

55

265

370r3523

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

Made in "Canada" Truck

3731762

56

265

Vette 2x4 Carbs

3737775

62-67

283/327

3740r997

57

283

 2x4 & FI (exc.-283hp)

3743056

58

283

3743096

62-67

327

GMC Truck

3747363

57-61

283

3747460

59-67

70cc

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

3767460

59-60

283

3767462

62-67

327

3767465

59-61

283

3767754

59-61

60cc

283

3767792

60-64

283

3774682

60-64

70cc

283/327

3774684

62-64

75cc

327

3774692

58-64

60cc

283

3782461

64-66

62cc

327

Camel hump, no accessory holes, 160/62cc port volumes

3782461X

60-63

62cc

283/327

Camel hump, no accessory holes, larger 172/64cc port volumes

3795896

63-65

60cc

283

3795896

62-64

60cc

327

3798996

63-67

327

3814480

60-67

 1.72/1.5

70cc

283/327

3814482

62-67

75cc

283/327/350

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

75cc

283/327

3884520

60-67

60cc

283

Some marked "Made in Canada",  also used by Studebaker

3884520

62-67

60cc

327

Some marked "Made in Canada",  also used by Studebaker

3890462

66-67

64cc

302/327/350

Camel hump, no accessory holes

3901068

87-up

64cc

350

Crate motor, 285HP

3911032

68

70cc

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

64cc

302/327/350

Camel hump, no accessory holes

3917292

68

64cc

327/350

Camel hump

3917293

67-68

75cc

307/327

3927185

69-76

70cc

307/327/350

3927186

69-70

64cc

302/350

Camel hump, has accessory holes

3927187

69-70

64cc

350

Camel hump, has accessory holes

3927188

69

74cc

327

3927188

70

74cc

307

3931633

68-73

307

3931635

68-76

350

3931638

68

327

Truck

3932441

69-70

76cc

350

3932441X

69-70

80cc

350/400

3932454

69-73

307

3932454

69-79

350

Truck

3946812

69

350

3946813

69-79

350

Truck

3947040

68

64cc

327

Right angle casting identifier,  good HP head, used in trucks,  no accessory holes

3947041

69-70

64cc

302/350

Right angle casting identifier,  accessory holes,  good HP head

3947041X

69-70

64cc

302/350

Right angle casting identifier,  165cc intake port,  accessory holes, good HP head

3951598

70

76cc

400

3964286

350

3965742

70

350

over the counter, angle plug L98 style

3970126

67-71

327/350

3973370

69-70

64cc

350

over the counter in US,  Canadian 350/300hp production use in Pontiac,  straight or angle plug

3973414

70

64cc

350

Camel Hump, LT1-350/370hp

3973487

71-72

1.94/1.5 or 2.02/1.6

75cc

350

was also used on '71 350/330hp LT1

3973487X

71-72

1.94/1.5 or 2.02/1.6

75cc

350

3973493

71-72

76cc

400

3986316

71

76cc

350

3986336

71

76cc

350

3986336X

71

76cc

350

3986339

71

74cc

307/350

3986339X

71

74cc

307/350

3986388

68-76

307/350

3991492

70

64cc

350

LT1, Camel hump, accessory holes, straight plug

3991492

70-up

64cc

Camel hump, straight or angle plug, over the counter

3998916

72

76cc

350

also used w/'72 350 LT1, big valve, screw in studs

3998920

72-73

350

3998991

72-73

75cc

307/350

3998993

72-73

75cc

307/350

3998993

current

75cc

350

.Goodwrench crate motors, Hecho en Mexico

3998997

72-73

76cc

350/400

76cc chambers

3998997

78-84

76cc

305/350

76cc chambers

4079261

75

350

10033867

62cc

Aluminum, over the counter Pontiac 23' head, angle plug, 196cc intake port

10045434

55cc

Aluminum, Over the counter Pontiac 15' head, angle plug, raised runner, "rollover" head

10051101

55cc

Aluminum, Bowtie, 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

194/1.5

58cc

350

Aluminum, angle plug, raised "D" port exhaust

10093328

61cc

Aluminum, Over the counter Pontiac 15' head, 224cc ports, "roll over" head

10106178

90

350

Aluminum, LT5, ZR1, DOHC, 32-Valve, pass. Side.

10106179

90

350

Aluminum, LT5, ZR1, DOHC, 32-Valve, drivers Side.

10110810

91-up

65cc

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

 53cc

350

Aluminum, Gen.II LT1, angle plug, reverse flow cooling, 175/68cc ports

10134352

Bowtie

 45cc

Aluminum,  angle plug, "low" port, 223cc intake port, 18' race head

10134363

Bowtie

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

Aluminum, LT5, ZR1, DOHC, 32-Valve, pass. Side.

10174390

91-95

350

Aluminum, LT5, ZR1, DOHC, 32-Valve, drivers Side.

10185040

Bowtie

45cc

Aluminum, Bowtie, 1st version, symmetrical ports, 263cc intake ports, splayed valves

10185040

Bowtie

45cc

Aluminum, Bowtie, 2nd version, symmetrical ports, 240cc intake ports, splayed valves

10205245

93

68cc

350

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

10207643

94-96

68cc

350

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

10208890

94-96

265

Gen.II, L99, 4.3 Liter V8, cast iron, reverse flow cooling

10215339

97

68cc

350

Aluminum, Gen.III, LS1,

10225121

94-95

350

Aluminum, LT5, ZR1, DOHC, 32-Valve, Drivers Side.

10225122

95

350

Aluminum, LT5, ZR1, DOHC, 32-Valve, Pass. Side.

10239902

96-up

54.4cc

350

Aluminum, Gen.II LT4, reverse flow cooling, 195cc Intake port, angle plug.

10239906

96-up

1.94/1.5

350

Vortec 5700, "L31", 170cc Intake port

12367712

99-up

2.00/1.55

62cc

Aluminum, FastBurn, 210cc Intake port

12367713

99-up

2.00/1.55

62cc

Aluminum, Fast Burn used on ZZ430 crate motor, 210cc Intake Port

12480005

2000

2.125/1.625

38cc

Aluminum, Ls1"GTZ", angle plug,

12480011

97-up

Bowtie "SB2.2"

48cc

Aluminum, "SB2.2" 2nd version, "mirror ports" revised valve angles and 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

Aluminum, Gen.II, "LT1"

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

Aluminum, Gen.II, "LT4"

12556743

99

325

Aluminum, Gen.III,  5.3L truck, van

12558059

97

1.84/1.5

305

Vortec, truck

12558062

98

1.94/1.5

68cc

350

L31 Vortec, 170cc Intake port, truck

12558806

97-98

68cc

350

Aluminum, Gen.III, "LS1"

12559853

99-up

68cc

350

Aluminum, Gen.III, "LS1"

12559862

99-00

Aluminum, GEN.III, 4.8/5.3L

12559895

00-up

325

Aluminum, Gen.III, Vortec, 5.3L

12561706

4-Jan

Aluminum, Gen.III, 5.3L

12561873

99-01

71cc

364

Iron, Gen.III

12562317

4-Jan

71cc

364

Aluminum, Gen.III

12564241

00-up

68cc

350

Aluminum, Gen.III, "LS1"

12564243

01-up

350/364

Aluminum, Gen.III, "LS6", "LS2"

12572035

4-Jan

71cc

364

Aluminum, Gen.III, 6.0L

14008856

79-81

267

14010201

82-85

305

14011034

Bowtie

64cc

Iron, 184cc intake ports, angle plug, "Phase II head"

14011049

Bowtie

55cc

Aluminum, 180cc intake port, angle plug, "Phase 6"

14011083

55-86

1.94/1.5

64cc

350

Crate motor for years indicated. 285/300HP

14014415

80-85

267/305

14014416

80-86

1.84/1.5

58cc

305

14014440

80

1.84/1.5

305

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

1.72/1.5 or 1.84/1.5

53cc

267/305

14022801

80-86

305

14024816

1.94/1.5

76cc

350

 Gen.I crate motors

14034806

78-82

267

14034807

78-86

305

14034808

80-86

350

14034808

96-up

1.94/1.5

76cc

350

 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

Aluminum, Gen.II, LT1

14089119

86-88

350

14094093

86-88

350

14096217

55-86

64cc

350

Crate motor, 285/300hp, 72' or 90' center intake manifold bolt angels

14101081

87-95

305

14101083

87-up

 64cc

350

Gen.I,  also used on crate motors, 285/300hp, 72' center manifold bolt angle.

14101128

86-87

 58cc

350

Aluminum, angle plug

14102187

87-91

1.84/1.5

305

14102191

87-up

350

14102193

87-up

1.94/1.5

305/350

22542525

Aluminum, Dart/Olds/Chevy, 14' or 17' race head

24502559

96-97

38cc

Aluminum, Bowtie, "SB2", 1st version, "mirror ports", 196cc intake ports, CNC Version 280cc intake ports

25500141

2.1/1.625

42cc

Aluminum, Buick/Chevy, 10' race head, symmetrical ports, 235cc intake ports

25534351C

04-up

2.00/1.55

 cast iron Vortec head, Gen.I Bowtie, 175/65cc ports, small port head

25534371C

04-up

2.00/1.55

 cast iron Vortec head, Gen.I Bowtie, 206/77cc ports, large port head

33417369

90-up

76cc

350

Gen.I Goodwrench crate motor, Hecho en Mexico