Pontiac changed the deck height call-out a few times over the years. Don't know why or if the machining actually changed or not. The 10.240" is as good of starting point as any other. If there has been a line bore or decking on the block all bets are off so deck height pretty much has to be measured every time before spending any money on pistons. Last two engines with original deck heights measured out at 10.235 and 10.238. The block just before these measured 10.227 so there was decking sometime in its existence, but couldn't tell until it was measured out because there was enough pitting and such that it looked original.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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