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Message: <blockquote data-quote="96blak54" data-source="post: 1343632" data-attributes="member: 14727">Your asking a question with alot of variables. Tarket .020" squish in account with all the expansion and tensile of the engine running. Getting that piston to kiss the head is where you want to be ..."max effort" and to achieve this you must use available resources such as head gasket thicknesses or o-ringing the heads to use thinnest gaskets on top of your projected figures. Stock modular gaskets crushed is .039", your alloy pistons are going to swell .030"(assuming stock bore) and I haven't had any dealings with the boss rods yet, so im uncertain of the tensile growth, but I do know they offer more hp handling, so im going on a limb here to say they probably have more tensile than old rods, so more stretch is probable. The aluminum block grows more over cast and offers more compression capabilities just because its aluminum,....I this is why ford started the aluminum block engines at 10.5:1 static in the lincolns while still running 87octane. You didnt specify the cams to be ran with this combo. Also a question for you,...and thank you for asking a question here,...why are you only running 11.5:1 static with a set of $2000 heads? I know your car is 4300#'s but youll have some nice rear gears back there.</blockquote>