392 Late Hemi Mopar DSS GSX Series Forged Piston (For use in 3.795' Stroke x 6.125' Rod) -5cc Flat Top with two large valve reliefs, 1.210' Comp Hgt, Includes .927' full floating Pin with double True Arc Pin locks, 1.5-1.5-3.0 mm low drag ring groove, patented 'X Groove' skirt design, Approximate Compression Ratio: (72cc Head = 10.40 to 1) (78cc Head = 9.78 to 1) (85cc Head = 9.16 to 1).