We have a new cam profile available for this engine for 2011. Although we have had a lot of success with our existing profiles in the seven years we've been grinding mower cams, we've been working hard the last few months to design and test some new profiles built just for lawnmower racing. We're also continuing to develop new camshaft profiles that are custom designed with the displacement and rpm ranges for other lawnmower racing engines. Mike at Precision Cams 910-251-0612