Easy to install didn't take to long. Finding the right size shims was Alittle time consuming. But with the combination of stage2 cam with high compression piston, I added +.001 thickness to intake/exhaust shims for the amount of heat output with upgrade piston and cam. Absolutely love the outcome of it!
2009 bigbear 400, had to macine the jurnal on cam to fit because the bearings are diffrent from 2007. the new found power is nuts. it now pulls the frount wheels off the ground in 1st and 2nd and now reaches 53mph.