Quote:
Originally Posted by 455dan
Had some street driven Pontiacs that had virtually no cylinder ridge at 100k miles.
Bought an original owner 67 executive for the 400 for a GTO build that was missing an engine.
When we pulled the heads off and measured the bores most had worn over .047 and the block had to be machined to 60 over to clean. original std pistons to.
Same engine- the crank measured as new and just a micro polish took care of it.
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That extra wear had more to do with PMD using both rings being made of plain iron.
Whitmore told me Pontiac switched to single moly top ring, cast iron 2nd ring around 67-68 and the cylinder wear went down dramatically