Username Protected wrote:
Update, I was able to successfully obtain a field approval for installing the high compression pistons, so this type mod is still possible, but took about 9 months!
Stephen, I must ask, what did it do for performance? If you have a fat wing 28 like mine I would not expect much more in cruise and a bit better take off and climb. Did you document before and after. No more auto gas STC and likely no 94UL with the high compression pistons.