deck/piston question

[DEL51]

Running pistons out of the hole. I redecked my block to remove the orings. The previous set of copper gaskets leaked water enough to milk the oil. Lukily on the last run of the season. I went with cometics and they said make the deck smooth. This put the dished pistons 20 thou out of the hole.Cometic rep said I could compensate with the gasket to maintain the same height. this is a blown 572@ 7.5 to1 jet boat lake delio. Runs about 11-14lbs of boost depending on what fuel i use. I am looking for an opinon from our seasoned builders. Thanks,Chris

[Fiat48]

Cut the pistons .020 and be zero deck. Hope you are steel rods.

[DEL51]

Oliver rods, steel/ forged. If I cut the 20 thou off will a rebalance be needed?

[Fiat48]

No need for rebalance. Don't worry about it if anything it would be a slight overbalance which is fine. Chuck them in a lathe and face them .020.

[gn7]

there will be a little less dish that way, so your comp. ratio will jump a little.

[MACHINEHEAD]

Run the .058 Cometic

[DEL51]

I think they are afraid the piston will be damaged by sticking out too far above the deck. 20 Thou above deck.

[MACHINEHEAD]

This will net .038 piston to head clearence. Sounds way safe with a steel rod to 6500 rpm