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Technical Information
Pontiac Bore & Stroke Figures

Pontiac Bore & Stroke Figures

Pontiac 400 428 455 Engine Codes

Pontiac 400 428 455 Engine Casting #s

Pontiac Cylinder Head ID #s

Cubic Inch Style Year Produced Bore Stroke

223.4

L-head Straight 8

1933-1935

3 3/16

3 1/2

208

L-head Straight 6

1935-1936

3 3/8

3 7/8

232.3

L-head Straight 8

1936

3.25

3.50

222.7

L-head Straight 6

1937-1940

3 7/16

4.00

248.9

L-head Straight 8

1937-1949

3.25

3.75

239.2

L-head Straight 6

1941-1954

3 9/16

4.00

268.4

L-head Straight 8

1950-1954

3 3/8

3.75

194.5 (1/2 389)

INDYFOUR

1961-1963

4.06

3.75

215

Overhead Valve 6

1964-1965

3.75

3.25

230

Overhead Cam 6

1966-1967

3.87

3.25

250

Overhead Cam 6

1968-1969

3.88

3.53

287

V-8

1955

3.75

3.25

316

V-8

1956

3.94

3.25

347

V-8

1957

3.94

3.56

370

V-8

1958

4.06

3.56

326

V-8

1963-67

3.781

3.750

350

V-8

1968-77

3.875

3.750

389

V-8

1959-66

4.063

3.750

400

V-8

1967-79

4.120

3.750

421

V-8

1961-66

4.094

4.000

428

V-8

1967-69

4.120

4.000

455

V-8

1970-76

4.150

4.210