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Message: <blockquote data-quote="PabloIceman" data-source="post: 3221224" data-attributes="member: 27799">Bozz, it doesn't work that way .....read this ....<a href="http://www.everything2.com/index.pl?node_id=766464" target="_blank">http://www.everything2.com/index.pl?node_id=766464</a>**Quote**Examples:basicStroke 100mmBore 87mmgasket thickness ... i dint know but worked aroundcomp ratio = (cylinder volume + combustion chamber volume)/ combiustion chamber volume = 9.5combustion chamber volume = some complicated stuff + head gasket volume- head gasket volume = (.5bore ^2) * pi * height(thickness) = 69937.3965 (using algebra and solving for this in above formula w/ the 2 knowns)cylinder volume = (.5bore ^2) * pi * stroke = 594467.87to achieve about ~ 8.9:1 assuming X = desired compression ratio TCV = CCV + G = total combustion chamber volumeCCV = combustion chamber G = gasket volume = (.5bore ^2) * pi * height(thickness)using some algebra that would be tedious to type we get: Cylinder volume = (X - 1) TCV .. some more algebra etc To find a thickness to get u around 8.9:1594467.87 = 7.9 * (69937.3965 + G) more algebra solve for g or shouldve done it earlier..G = 5311.70095 (volume of addditional gasket) now solve for thicknessassuming the new gasket has the same bore as the cylinder (87mm)additional gasket thickness would be ~.89 mm or ~.035 inches to achieve static 8.9:1 compressionan additional .025 inches or .635 mm should bring down the compression ration to about 9.0647:1assuming the same bore as the cylinder.Now u just need to know your original head gasket thickness.Source from the above link & some other websites (rpw & EM). Figures purely theoretical.Bear in mind that the piston tops are not flat landings ... **UNQUOTE******Pls. see my signature***</blockquote>