Al, have you come up with any amount of compression increase needed to offset the effects of an aluminum block? I calculate compression by figuring in the block deck increase due to heat. My cold piston to head is .040, and use +.010 added to below deck measurements cold, since that is where it will be under load. But i doubt that will also account for rapid heat loss due to the block being aluminum, which will reduce power output more..
Just pick number for deck height, they are all different and only way to find the limit is sneak up on it. .040" P to H is giving up a LOT of space IMO. As for the compresion ratio I would look at least going 1.5-2 numbers higher. From my experience a 15-1 aluminum engine is not alot ....
