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The issue I see is the piston to wall clearance has to be tighter than the factory cast pistons. With any hyper this is so. So .001" wear already makes the bores too large IMO. Read the post about bulging up valley pans with regard to ring sealing. Hypers are installed tight because they dont expand. Put them in loose and they may be noisey, they will not allow the rings to seal as well, and they might end up rocking over time and hurting the skirts. If this is a "for the time being" I'd simply run what you have (stock, or upgrade and have it bored for proper fitting hypers... Then when you tear it down again, you can simply hone it to the proper clearance for the good forged units.



The clearance was one of my concerns but after looking at the chart on their site it states .0020" - .0045" for bores over 4.100 in an na drag application with a top ring gap factor of .0075. It should be no problem to set it up in the middle at .003.



Are you are assuming the bore you have now is on the TIGHT side ?

I personally don't have any use for a Hyper piston other than an ASH TRAY and I don't SMOKE ..