Thanks- He has forged pistons that have a .110" positive deck height, so this is the solution to making the Stealth closed chamber heads fit. It essentially is the same as having a flat top piston @ 0.00" deck height and closed chamber heads. Compression will actually drop .4 from what he had @ 10.4, but he also was looking to be able to cruise on lower octane gas instead of running 91+ all the time and the CR drop and alloy heads will let him do that.