Pontiac Engine Bore Sizes
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Pontiac Inline Engine Bore Sizes
| 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 of 389 |
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 |
Pontiac V8 Engine Bore Sizes
| Cubic Inches | Year(s) | Bore (inches) | Stroke (inches) | Main Journal size (inches) | Rod Journal size (inches) |
|---|---|---|---|---|---|
|
265
|
1977 ? | 3.750 | 3.000 | 3.00 | 2.250 |
|
287
|
1955 | 3.750 | 3.250 | 2.50 | 2.20 |
|
301
|
1977 ? | 4.000 | 3.000 | 3.00 | 2.250 |
|
303
|
1969-70 | 4.1250 | 2.840 | 3.00 | 2.250 |
|
316/317
|
1956 | 3.9375 | 3.250 | 2.50 | 2.20 |
|
326
|
1963 | 3.781 | 3.750 | 3.00 | 2.250 |
|
326
|
1964-67 | 3.71875 | 3.750 | 3.00 | 2.250 |
|
347
|
1957 | 3.9375 | 3.5625 | 2.623 | 2.20 |
|
350
|
1968-77 | 3.8750 | 3.750 | 3.00 | 2.250 |
|
366
|
1969-70 | 4.1530 | 3.3750 | 3.00 | 2.250 |
|
370
|
1958 | 4.0625 | 3.5625 | 2.623 | 2.20 |
|
389
|
1959-66 | 4.0625 | 3.750 | 3.00 | 2.250 |
|
400
|
1967-79 | 4.120 | 3.750 | 3.00 | 2.250 |
|
421
|
1961-66 | 4.09375 | 4.000 | 3.250 | 2.250 |
|
428
|
1967-69 | 4.120 | 4.000 | 3.250 | 2.250 |
|
455
|
1970-76 | 4.150 | 4.210 | 3.250 | 2.250 |
