mfg Posted January 3 Report Posted January 3 Pistons of the same diameter for a ‘64 Thunderbolt 289 will interchange with Avanti ‘R’ pistons as long as they are swapped as a complete set…..True?
Mark63Avanti Posted January 3 Report Posted January 3 I'm going to say "no" because the R engine pistons were flat top.
mfg Posted January 3 Author Report Posted January 3 27 minutes ago, Mark63Avanti said: I'm going to say "no" because the R engine pistons were flat top. Sorry, answer is TRUE, although there would be a considerable drop in compression ratio.
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