ICON 461 PISTONS
These pistons sit a bit higher in the bore so if your deck is stock height and in good shape, this is a good manufacturer to use. If you need to deck the block around 020" then you will probably need to mill your intake flanges around .060" so the bolt holes line up. For the Performer RPM intakes, the BOTTOM of the runners will interfere on the valley pan EVEN MORE now so clearancing will be in order.
FLAT TOP OR DISH