Can I install 1970 Buick 455 heads on my 1975 block?
In mid-year 1972 Buick 455 engines had their (center) coolant passages changed. The blocks and heads changed from single scallop passages to double scallop passages.
- 1967 thru early 1972 head castings can be installed on late 1972 thru 1976 blocks. Just be sure NOT to use the steel shim head gasket
- Late 1972 thru 1974 heads can be installed on 1970 thru early 1972 blocks, IF the center two, round coolant passages are plugged in the head.
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