This pistons will fit 4g63T, 7 bolt engines, also know as 2nd Gen. , as well as Evo 8-9
Using .050" (1.27mm) gasket thickness to calculate compression
Flat top pistons
Compression Ratio for 4g63T is ~~9.3:1
Compression Ratio in the Evo 8-9 is ~~ 10:1