Just did some number crunching and piston comparison with the help of KB's compression calculator; in all cases head volume was 68cc, gasket crush thickness .039, gasket dia 4.10, deck clearance based on deck height of 9.600:
Sealed power 285AP30 comp ratio....7.496
Mahle S224-2007.020 comp ratio...7.762
KB167 .030 comp ratio......8.89
Info for pistons from Summit Racing
Admittedly all these numbers can be manipulated to change the out come to prove or disprove a point of view
