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Mike,
   My IO320 was overhauled at 9:1 compression instead of the designed
8.5:1.  However, the overhauled (Don George in Florida, who has done a lot
of Lancair engines) advised against deviating much from the design figures.
The Sky Ranch Engineering Manual gives real insight and into how many
different "fixes" there have been in aircraft engines over the years and an
understanding that when you make changes there is the possibility of
introducing new "problems."

Bob Chesley
L-320 Builder
Ojai, CA