I pulled an SR 428HO from a '68 Bonneville 'vert years ago. I recall it was an early 70s cast date on the replacement block, so not sure how that bock made it into that car. No code stamp or S/N stamped on the front of the block. SR castings were probably made during production, and apparently long after.
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Jim K in PA
1967 GP HT 428
1967 GP convert 428
1957 Chieftain 4D HT
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