Casting #

Size

Year

Mains

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

77-79

2 or 4

some Canadian assembled heavy duty blocks have 4-bolt main caps

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 or 4

some Canadian assembled heavy duty truck blocks have 4-bolt main caps

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

66-67

2

3896948

283

66-67

2

3903352

327

67

2

3914636

307

68

2

3914638

327

68

2

Truck

3914653

307

68-73

2

3914660

327

68

2

3914678

302

68

2

Z-28 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

Z-28 Camaro

3932386

327

69

2

3932386

350

69

4

3932388

350

69

2 or 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 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

62-67

2

Was also used for some replacement blocks

3970010

302

69

4

Z-28 Camaro

3970010

327

69

2

Trucks and industrial

3970010

350

69-80

2 or 4

3970014

350

70-76

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

92

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-1, 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

96-98

2

Vortec truck, roller cam, one-piece rear seal

10243880

350

95-00

2 or 4

Vortec truck, Gen. I crate motors and "ZZ4", roller cam, one piece rear seal

12550592

350

97-up

crossbolted block, Gen. III, "LS1", Aluminum

12559378

350

99-up

crossbolted block, Gen. III, "LS1", Aluminum

12559846

350

98-up

crossbolted block, Gen. III, "LS1", Aluminum

12560621

350

98-up

crossbolted block, Gen. III, "LS1", Aluminum

12560629

350

99

crossbolted block, Gen. III, "LS1", Aluminum

12561168

350

01-up

crossbolted block, Gen. III, "LS1", Aluminum

12562174

350

98-up

crossbolted block, Gen. III, "LS1", Aluminum

14010201

305

80-85

2

14010202

305

80-85

2

14010203

305

80-85

2

14010207

350

80-85

2 or 4

14010209

350

80-85

2 or 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

14101147

305

85-up

2

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