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Small Block Chevy Engine Block Identification
 

General block Info | Block Casting Numbers | Block Casting Date | Engine Code Stamping | Casting Clock Code
VIN Code Format | Camaro Specific Engine Codes | Small Block Suffix Codes

 

General Engine Block Specifications
While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. 283 blocks (3.875" bore, 2.3" main), 302/327/350 blocks (4" bore, 2.3" or 2.45" mains), and 400 blocks (4.126", 2.65" mains). In 1968 the main bearing saddles were increased in size from 2.3" to 2.45".

CID

 

 Year

 

 Bore

 

 Main Cap
262

 

 1975

 

 3.671

 

 2 bolt ONLY
267

 

 1979 - 81

 

 3.500

 

 2 bolt ONLY
305

 

 1976 - 96

 

 3.736

 

 2 bolt ONLY
307

 

 1968 - 73

 

 3.875

 

 2 bolt ONLY
327

 

 1968-69

 

 4.001 (2.3" main)

 

 2 bolt
350

 

 1968-88

 

 4.001 (2.3" main)

 

 2 bolt
265

 

 1994

 

 4.001 (2.45" main)

 

 2 bolt
302

 

 1968-69

 

 4.001 (2.45" main)

 

 4 bolt
350

 

 1968-96

 

 4.001 (2.45" main)

 

 4 bolt
400

 

 1970-72

 

 4.126 (2.65" main)

 

 4 bolt
400

 

 1973-80

 

 4.126 (2.65" main)

 

 2 bolt

Notes: 2 bolt ONLY means what it says. You will NOT find a 4 bolt 305 block (made by the factory). Period. Otherwise 2 or 4 bolt can mean either design...

 

Engine Code Stamping Numbers
All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. 6 cylinder engines are stamped on the passenger side of the block behind the distributor.
Click here for Chevy Engine Code Listings

The engine date must precede the car build date, otherwise something is amiss. Some engine machining operations (decking) will obliterate the engine ID.

Engine ID Code Example: V0101CLJ - (V = Plant, 01 = Month, 01 = Day, CLJ = Engine Suffix Code)
Another example: T0830CTY - (T = Tonawanda, 08 = August, 30 = 30th day, CTY = 1970 396 Camaro, 375 hp, 11.0:1, TH400)

Code

Engine Plant

Code

Engine Plant

F

Flint (Motor)

S

Saginaw Service

H

Hydramatic

T

Tonawanda

K

St. Catherines, Ontario

V

Flint (Engine)

(McKinnon Industries Canada)

M

GM of Mexico

 

Casting Clock
On some Saginaw blocks, intakes and exhausts a "clock" was cast into the block. The clock is a circle of 10 dots, one dot for each hour of a shift (usually 10 hour shifts). An arrow points to the beginning of the shift an another dot outside the circle indicates what time of day the cast part was made. Anyways, that's what that circle thing is (if you happen to see it on something).

 

Camaro Engine Code Stamping Numbers
Dropbox contains Camaro engine suffix codes for year selected.

 

Casting Date
Small block casting date is located on driver side rear of block on flange forward of bellhousing. Big block on the right side of engine above the oil pan rails.

Casting Date Example: E038 - (E = Month, 03 = Day, 8 = Last digit of model year (1978)).

Month: A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G = July, H = Aug, I = Sep, J = Oct, K = Nov, L = Dec

VIN Code Format
The vin code format is stamped onto most engines. The format consists of divisional identification number, model year, assembly plant designation and vehicle serial or sequence number.
In 68-69 model cars, the serial (VIN) number of the car the engine was installed in is stamped next to, or under the engine code ID.
Starting in 1970, the serial number is stamped either above the oil filter, somewhere on the block pad (in front of the cylinder head), or on the transmission flange somewhere. Chevrolet issued technical service bulletins to indicate which engines were to recieve a vin stamp, so who knows what could have happend (or not happened).

VIN code format Example: 13N100001
(1 = Chevrolet, 3 = 1973, N = Norwood, 100001 = Production sequence of vehicle VIN)

For a list of assembly plants, click here.

 

Engine Block Casting Numbers

Notes (for below): "High Power" is the maximum rate HP this block was used for, "Low Power" is the lowest rated horsepower RPO engine the block was used in. "Main Caps" is the number of bolts holding the cap. A "two-bolt" main, or a four-bolt main. Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure. However, a properly prepared 2 bolt main engine will work just fine (often times you'll lose a rod bolt before you break a crank because it's "only" a 2 bolt main).

Years

Casting

CID

Low Power

High Power

Main Caps

Comments

1980-85

140029

350

-

-

2

car

1973-80

330817

400

150

180

2

car, truck

1975

355909

262

110

110

2

car, truck

1976-85

355909

305

-

-

2

A

1975

360851

262

-

-

2

Monza

1976-79

361979

305

-

-

2

car, truck

1978-86

366245

350

-

-

-

car

1982-86

366286

350

-

-

4

Chevrolet, siamese

1982

366299

350

-

-

4

Chevrolet, aluminium

1956-67

383810

283

-

-

2

-

1967-68

389257

302

-

-

2

Z-28

1968-73

391436

307

-

-

2

-

1965-67

393288

283

-

-

2

car, truck

1976-79

460776

305

-

-

2

car, truck

1976-79

460777

305

-

-

2

car

1978-79

460778

305

-

-

2

car, truck

1979-82

471511

267

-

-

2

car, truck

1976-85

581671

305

-

-

2

A

1985-94

1489363

350

-

-

2

-

1979-82

2135412

267

-

-

2

-

1979-82

2404929

267

-

-

2

1973-76

3030817

400

-

-

2

car, truck

1958-61

3556519

283

-

-

2

car, truck

1955

3703524

265

195

_

2

car, no filter

1955-56

3720991

265

195

225

2

car, truck

1957

3731548

283

220

283

2

-

1956-67

3736935

283

-

-

2

-

1957-59

3737739

283

220

290

2

car, truck

1958-62

3756519

283

170

315

2

car, truck

1956-67

3756935

283

-

-

2

-

1962-65

3782870

327

250

375

2

car, truck

1956-67

3789187

283

-

-

2

-

1962-67

3789817

327

210

275

2

car, truck

1961-62

3789935

283

170

315

2

Late 61 car & vette

1962-67

3790721

283

170

220

2

Chevy II

1964-67

3791362

327

250

300

2

Replaced 3790721

1958-63

3794226

283

170

195

2

Car & truck

1968-69

3794460

327

250

250

2

truck

1968-69

3814660

327

-

-

2

F A

1968-69

3814660

302

-

-

4

Camaro, Z-28, Vette

1963

3830944

327

-

300

2

-

1956-67

3832338

283

-

-

2

-

1964-66

3834810

283

195

220

2

Car, truck & marine

1962-63

3834812

283

170

195

2

car & truck

1958-62

3837739

283

-

-

2

-

1964-68

3849852

283

195

220

2

car & truck

1956-67

3849859

283

-

-

2

-

1956-67

3849935

283

-

-

2

-

1964-67

3852174

327

-

-

2

car, truck

1968-76

3855961

350

-

-

2

car

1964-67

3858174

327

275

350

2

Full, A & Y

1964-67

3858180

327

250

300

2

-

1962-67

3858190

327

-

-

2

-

1965-67

3862194

283

195

220

2

Chevy II

1962-66

3864812

283

230

-

2

car, truck

1964-67

3868657

327

300

-

2

1962-67

3876132

327

-

-

2

1963

3889935

283

-

-

2

truck

1967

3892657

302

290

290

2

Z-28, small journal

1967

3892657

327

210

350

2

car & truck

1967

3892657

350

295

295

2

Camaro

1968-69

3892659

327

210

-

2

1967

3896944

283

195

195

2

replaced by 307 in 68

1967

3896948

283

195

195

2

identical to 3834810

1967

3903352

327

210

350

2

cars only

1969-80

3911460

350

-

-

2

A

1968-73

3914635

307

-

-

2

car

1968

3914636

307

200

200

2

car & truck

1968-69

3914638

327

-

-

2

1968-73

3914653

307

-

-

2

A

1968

3914660

327

210

300

2

cars

1968

3914678

302

290

290

2/4

Camaro, Z-28

1968

3914678

327

210

350

2

car & truck

1968

3914678

350

295

295

2

Camaro/ChevyII

1965-67

3932288

283

-

-

2

A

1956-67

3932338

283

-

-

2

1974-75

3932368

350

-

-

2

1969-73

3932371

307

-

-

2

car,truck

1969-73

3932373

307

-

-

2

car,truck

1969

3932386

302

290

290

4

Camaro Z28

1969

3932386

327

210

210

2

Camaro

1969

3932386

350

300

350

4

LT1

1969

3932388

302

290

290

4

Z28

1969

3932388

350

300

300

4

cars

1968-69

3933100

327

-

-

2

1968-69

3933180

327

-

-

2

1968

3941174

307

-

-

2

truck

1956-67

3949852

283

-

-

2

1970-80

3951509

400

150

265

2/4

car,truck

1970-73

3951511

400

255

265

4

B & G body

1962-67

3953512

327

-

-

2

1968-69

3955618

327

-

-

4

A,F,Vette

1969

3956618

302

290

290

4

Z28

1969

3956618

327

235

235

2

fullsize

1969

3956618

350

250

350

2/4

cars

1969

3956632

307

200

200

2

car & truck

1969-76

3958618

350

-

-

2

A

1962-63

3959512

327

250

-

2

1956-67

3959532

283

-

-

2

1968

3970010

327

-

-

2

A

1969-79

3970010

350

185

370

2 or 4

car, truck, Vette

1970-73

3970014

350

200

300

2/4

LA built Camaro

1969-73

3970020

307

115

200

2

car,truck

1969-72

3970024

307

130

200

2

A,F,X

1968-76

6259425

350

-

-

-

car,truck

1980-84

14010201

305

-

-

2

car,truck

1980-84

14010202

305

-

-

2

car,truck

1980-84

14010203

305

-

-

2

car, truck

1980-82

14010205

267

-

-

2

-

1980-85

14010207

350

-

-

4

truck

1980-85

14010209

350

-

-

4

truck

1978-86

14010231

305

-

-

2

-

1979-82

14010280

267

-

-

2

car

1982

14011064

350

-

-

4

Chevrolet, high tin

1979-82

14016375

267

-

-

2

-

1979-82

14016376

267

-

-

2

car

1978-85

14016379

350

-

-

-

car, truck

1980-84

14016381

305

-

-

2

car, truck

1978-88

14016383

305

-

-

2

-

1979-82

14040205

267

-

-

2

-

1978-86

14049047

305

-

-

2

1986-94

14079287

350

-

-

-

1987

14088526

350

-

-

2

Camaro

1986-94

14088548

350

-

-

-

-

1986-92

14088551

305

-

-

2

-

1988-94

14093627

305

-

-

2

-

1986-94

14093638

350

-

-

-

1988-94

14094766

305

-

-

2

1986-94

14101148

350

-

-

-

1987-88

14102058

305

-

-

2

1969-85

14316379

350

-

-

2