The Mod Shop 850cc stage 2 cam is specifically designed for the 850cc engine with aftermarket pistons. The Mod Shop don't sell 800 cams for the 850 like others do. The Mod Shop 850cc stage 2 cam has bottom end to top end power. The Mod Shop made sure the bottom end power was not sacrificed. Stage 2 cam has smooth power curve while still giving a 14hp gain. Made to work with stock valve springs. Peak power is at 8400-8700rpm. Requires head modification for clearancing and aftermarket pistons. Fuel tuning required.