[wesmigletz]

With a 22cc dish, a .041 thick gasket, a .025" deck height and a 64cc combustion chamber, you will be around 9.3:1 compression. Be careful with rebuilder pistons, they have larger dish volume and sit further in the hole, typically .045" down.

My son's 406 is around 8.0:1 compression with it's rebuilder pistons and stock 76cc head. When he swaps to Vortecs, he will still be around 8.6:1.