Step-Lock guides, flow-enhancing valves and performance springs. The cylinder head gasket surfaces are trued and then the compression is raised by precisely fitting proprietary 10.5:1 forged
pistons to the stock 110ci cylinders using torques plates.
Red Shift cams, Pro-Taper pushrods and Dual Piston cam chain tensioners are included with Axtell’s oil pressure bypass valve for increased life and valve train control. A pre-mapped ThunderMax with Wave Tune AutoTune is included, allowing dyno-free set-up. High flow injectors are included with the kit (however, the kit does require the separate purchase of a H-D 58mm Screamin’ Eagle TBW throttle body).
Zipper’s states that once the kit is installed both torque and horsepower are increased across the rpm range, with horsepower raised by 45 percent, and torque over 100ft/lbs from 2,500 through 6,500rpm.