MHP +6.4cc Pistons for S&S 4.250" Bore Cylinders 128/131 cubic inch setups MHP-P4250

Moonshine Horsepower +6.4cc Pistons are designed to be a direct replacement for 4.250" S&S 128 and 131 setups when running a high horsepower camshafts with larger intake duration on your M8. Need to run with correct camshaft, high flowing ported heads and intake manifold. Designed to run on pump gas equivalent to 91 octane or greater.  FEATURES; CP Carrillo X-Forgings +6.4cc dome .043 top ring .043 second ring 3.0 oil control ring V-Shaped Accumulator Groove Underhead CNC Milled, Lighten  Shelf Mill, Lighten Double Oilers Per Pin Side COMBATIBLE WITH THESE SETUPS AND PARTS; 128 cubic inch, 4.250" cylinders and 4.500" stroke flywheel 131 cubic inch, 4.250" cylinders with 4.625" S&S stroker flywheel (works with the stroker setup since the rod is .0625" shorter than a factory H-D rod).  .043, .043. 3.00 S&S ring sets supplied in most S&S Cylinder And Piston Kits and S&S Power Packages RECOMENDED CHAMSHAFTS Moonshine Horsepower 588  Star Racing 3/4 Ward Performance