Well, I'm guessing a little on a couple values. But... The area that within .008"... That's the flat surface on the top of the dome..right? When you are asked about the piston's "deck hieght", what is being referenced is no tthe top of the dome, or the bottom of any dish. But the flat surface the dome or dish is protruding from/machined from. So really, if the dome is .008" above the block's deck, the flat the dome comes up from should be at least .060 down in the bore. So that means, that "11.5:1 piston" in your block with the average guestimate 78cc 906 open chamber, is really 8.8:1 static. That was the same issue with that 440 I mentionned before. In order for that to be true 11.5:1, the piston's flat surface would nee to come right close to the deck surface, and the dome would pop way out. If that's the case, that Lunati cam isnt a bad choice really. If you can't find the right cam in a catalog, it's because you dont have the right info top base the decision on.