But the optional factory domed pistons have nearly the same dimensions and ran with the heads im using, I know the highest point the piston will be above deck and lowest points on the head and how far the valve lift in planning on having is going to go, honestly all signs point to them fitting and giving me a static 10.82 to 1 compression ration with all otherwise stock parts which is what I’m doing, heads will be ported and will have a cam but valve clearance I know isn’t a problem. I’ll grind down a small about of the quench pad if needed but I think they should fit so I figured I’d come here and find out if anyone has, search feature was fruitless on this one but similar comes work in the 273, same head I’m using and everything just a smaller bore; the high point on the piston is the same it’s just is the slope on the new pistons too steep and will that cause contact. I know what measurements I’d like with flat tops, I’ve done dozens of 318s decks with kb67’s at 0 deck with 302 or 920 heads and with the right supporting parts they have no trouble making 450-509 crank, I think with the added compression and the right cam choice I can get maybe 550 crank just with different pistons than usual. The dynamic compression with the cams I’ve been looking at will be about 10.7 to 1 almost exactly which would be perfect for me. Not too wild, can run on premium pump gas no problem but will still get up and go without hesitation. I’ve made 318’s with more compression with aftermarket parts and they were awesome, up to 13 to 1 compression as long as you have a quench pad with a small enough gap running premium doesn’t cause knock at all