Casting #

Years
made

Size

HP levels
used for

Notes

3703524

55

265

N/A

Passenger
First 6 mos. used mech. cam not hyd.

3720991

56 - 57

265

N/A

Truck/Pass

3731548

57

283

N/A

N/A

3556519
3737739

58 - 61

283

220-290

2-Bolt mains/Truck/Pass

3849852

58 - 64

283

220-315

2-Bolt mains/Truck/Pass

3789935
3864812

62 - 64

283

230-315

2-Bolt mains/Truck/Pass

3959512

62 - 63

327

250

2-Bolt mains

3789817
3794460

62 - 64

327

250

2-Bolt mains
Truck/Pass

3858174

62 - 67

350, 327 & 302

210-350

2-Bolt mains/Truck/Pass

3782870

62 - 67

327

250-375

2-Bolt mains/Truck/Pass

3858180

62 - 67

327

250-375

2-Bolt mains/Truck/Pass

3791362

65 - 67

327

N/A

2-Bolt mains/Chevy II

3892657
3782870
3903352
3789817

64 - 67

350, 327 & 302

210-350

2-Bolt mains
Truck/Pass

3849852
3849935
3896944
393288

65 - 67

283

N/A

Truck/Pass

389257

67 - 69

302

N/A

2-Bolt mains
67 Small Journal (327 block)
68-69 Large Journal (350 block)

3914653
3914636
3932373
3970020

68 - 73

307

N/A

Truck/Pass

3956632

69

307

200

2-bolt mains

3914660

68

327

210-275

2-bolt mains

3790041
3814660
3955618

68 - 69

327

210-300

2-Bolt mains
Corvette/Camaro/Hi PO

3914678

68 - 79

350, 327 &: 302

210-350

2-Bolt mains

3855961
3958618
3970014
6259425

68 - 76

350

210-300

2-bolt mains
Pass.

3970014

68 - 79

350

200-255

2&4-Bolt main

3956618
3932386

68 - 79

350 & 302

250-300

4 bolt mains
Truck/Hi Perf

3970010

68 - 79

350 & 327

145-375

2&4-Bolt mains/Truck/Hi Perf

3932388

69

350

300

4-bolt mains

3951511

70 - 73

400

255-265

4 Bolt mains/HD Truck/Pass

330817

70 - 80

400

150-180

2-Bolt mains

360851

74 - 76

262

N/A

Monza

3951509
3030817++

74 - 76

400

150-265

2 Bolt Mains
++High Nickel Block

460776
460777
460778
361979

78 - 79

305

N/A

Lt. Truck/Pass

14016379

78 - 79

350

N/A

Lt.Truck/Pass

366245*

78 - 79

350

N\A

4-Bolt mains
*Bowtie High Tin
Dipstick in Pan

1401280
14016376
471511

79 - 82

267

N/A

Passenger

14010201
14016381
14010202
14010203

80 - 84

305

N/A

Lt. Truck/Pass

1401029
14010207
14010209

80 - 85

350

205 & up

2&4-Bolt mains
Passenger cars

14011064*

82 - 86

350

N\A

4-Bolt mains/*Bowtie High Tin

14088548
14093638
14316379

86 - 88

350

205 & up

2&4-Bolt mains
1 piece rear main seal.