Requires: Hi-compression Race Pistons (rec. MAP9011 (T120) or MAP9013 (T140)) Race springs PM0300, PM0290, PM0295, PM0292 or PM0296 (as determined per useage) Hi-performance pushrods MAP1722 (T120 "long rod") or MAP1724 (T140 "short rod") Use with New or Resurfaced "STD" tappets (.750" radius) INTAKE Only. If sending in for regrind be sure to check for stems for wear (.3115-.3105") Check tappet block at TDC for clearance Check lobe interference with some flywheels (allow .060")