I know the IA-II blocks have about 0.650 on the deck. I dont see what is wrong with going down to 9.800. The Hemi guys do it all the time. They have the same deck thickness and often go from 10.750 down to 10.200 to 10.300. The really fast ones rub the sand molds and get down to 9.800. Makes for a really light piston for that short 3.75 stroke.
Lynn
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