Originally Posted by Tony H

Next installment: I cannot increase the dish volume enough on the 4.5 pistons to get the cr under around 10:1. The dish is shallow and there is not much material left on the sides. So I am pursuing a few different directions on the custom pistons-having custom pin bushings made or having the new piston pin bores made for undersize pins and then honing for my 26mm pins. I think 10:1 would be pushing it using pump gas.