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Technical Information Pontiac Bore & Stroke Figures
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
1936
3.25
3.50
222.7
1937-1940
3 7/16
4.00
248.9
1937-1949
3.75
239.2
1941-1954
3 9/16
268.4
1950-1954
194.5 (1/2 389)
INDYFOUR
1961-1963
4.06
215
Overhead Valve 6
1964-1965
230
Overhead Cam 6
1966-1967
3.87
250
1968-1969
3.88
3.53
287
V-8
1955
316
1956
3.94
347
1957
3.56
370
1958
326
1963-67
3.781
3.750
350
1968-77
3.875
389
1959-66
4.063
400
1967-79
4.120
421
1961-66
4.094
4.000
428
1967-69
455
1970-76
4.150
4.210