This is a .265" lift Dyno cam. This cam is designed for use with larger than stock carburetors. Duration is 236 on the intake and 236 on the exhaust. No block clearance needed for this cam. Drop in and go! 18lb valve springs recommended. This is our best bang for the buck, top choice. Fits Honda GX160/200, 196cc clone and Hemi Head 212cc Predator engines.