Pontiac Blocks Casting Information |
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1955-1963Blocks up to 1963 have side of block casting numbers Up to 1963 have stud oiled heads
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| Year | CU IN | Casting # |
| 1955 | 287 | 518037 |
| 1956 | 316 | 521560 |
| 1957 | 347 | 523293 |
| 1958 | 370 | 528456 |
| 1959 | 389 | 532000 |
| 1960 | 389 | 536387 |
| 1961 | 389 | 538181 |
| 1961 | 421 | 538181 |
| 1962 | 389 | 538181 |
| 1962 | 389 | 542426 (SR) |
| 1962 | 421 | 538181, 548913 (late) |
| 1963 | 326 | 538211 |
| 1963 | 389 | 543680 |
| 1963 | 421 | 544988 |
1964-19661964 and up now had block mounted starters
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Block codes are were now dated ex. Letter represents month, first digit day, second digit year 9773155 with code J23- October 2nd, 1963 9782611 with code F126- June 12th, 1966 |
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| Year | CU IN | Casting # |
| 1964 | 326 | 9773153 |
| 1964 | 389 | 9773155 |
| 1964 | 421 | 9773157 |
| 1965 | 326 | 9778840 |
| 1965 | 389 | 9778789 |
| 1965 | 421 | 9778791 |
| 1966 | 326 | 9778840 |
| 1966 | 389 | 9778789 |
| 1966 | 421 | 9778791 (early) |
| 1966 | 421 | 9782611 (late) |
1967-1969Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8 |
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| Year | CU IN | Casting # |
| 1967 | 326 |
9786339 |
| 1967 | 400 | 9786133 |
| 1967 | 428 | 9786135 |
| 1968 | 350 | 9790079 |
| 1968 | 400 | 9790071 |
| 1968 | 400 RA | 9792506 |
| 1968 | 428 | 9792968 |
| 1969 | 350 | 9790079 |
| 1969 | 400 | 9790071 |
| 1969 | 400 RA IV | 9792506 |
| 1969 | 428 | 9792968 |
| 1969 | 303 | 546313 |
| 1969 | 400 RA V | 9792968 |
| 1969 | 428 RA V | 545887 |
1970-1977400 blocks with 557 casting numbers have thin main journals.
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| Year | CU IN | Casting # |
| 1970 | 350 |
9799916 |
| 1970 | 400 | 9799914 |
| 1970 | 400 RA III | 9799914 4-Bolt |
| 1970 | 400 RA IV | 979991 (5) 4-Bolt |
| 1970 | 400 RA V | 481708 4-Bolt |
| 1970 | 455 | 9799140 |
| 1971 | 350 | 481990 |
| 1971 | 400 | 481988 |
| 1971 | 455 HO | 483677 |
| 1971 | 455 | 485428 Late HO |
| 1972 | 350 | 481990 |
| 1972 | 400 | 481988 |
| 1972 | 455 | 485428 |
| 1972 | 366 | (485)212 |
| 1973 | 350 | 488986 |
| 1973 | 400 | 481988 |
| 1973 | 455 | 485428 |
| 1973 | 455 SD | (490)132 |
| 1974 | 350 | 488986 |
| 1974 | 400 | 481988 |
| 1974 | 455 | 485428 |
| 1974 | 455 SD | (490)132 |
| 1975 | 350 | 488986 Early |
| 1975 | 350 | 500810 Late |
| 1975 | 400 | 481988 Early |
| 1975 | 400 | 500557 Late |
| 1975 | 455 | 500813 |
| 1976 | 350 | 500810 |
| 1976 | 400 | 500557 |
| 1976 | 455 | 500813 |
| 1977 | 400 | 568557 |
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