Alamo Area Chapter
Pontiac-Oakland Club International

 
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Pontiac Block Identification
Year Engine (cid) Casting Number
1955287518037
1956316521560
1957347523293
1958370528456
1959389532000
1960389536387
1961389538181
1961421SD538181
1962389538181
1962389542426 SR
1962421SD538181
1963326538211
1963389543680
1963421544988
19643269773153
19643899773155
19644219773157
19653269778840
19653899778789
19654219778791
19663269778840
19664219778791 early
19664219782611 late
19673269786339
19674009786133
19674289786135
19683509790079
19684009790071
1968400RA9792506
19684289792968
19693509790079
19694009790071
1969400RA ID9792506
19694289792968
1969303546313
1969400RA V9792968
1969428RA V545887
Note: 67-68 428's were all 4 bolt main, in 69 the YH code 428 was 2 bolt, the rest were 4 bolt.
19703509799916
19704009799914
1970400RA III9799914
1970400RA IV9799915
1970400RA V481708
19704559791140
1971350481980
1971400481988
1971455HO483677
1971455485428 late HO
1972350481990
1972400481988
1972455485428
1973350488986
1973400481988
1973455485428
1973455SD(490)132
1974350488986
1974400481988
1974455485428
1974455SD (490)132
1975350488986 early
1975350500810 late
1975400481988 early
1975400500557 late
1975455500813
1976350500810
1976400500557
1976455500813
1977400568557