Wiseco Tracker Series Piston Kit (103ci.) - Standard Bore, 10.5:1 Compression K0210PSForged piston crown with generous valve pockets for big valves and cams Precision fit rings selected for each application for ultimate sealing Force fed pin oiling provides enhanced lucubration of the piston pin Pressure seal groove reduces ring lifting and power loss ArmorGlide skirt coating reduces friction, providing quieter operation and improving scuff resistance Valued packaged with two pistons, rings, piston pins and circlips Made in the U. S.