to take advanage of the new cams you should increase the compression also...since you prob. can afford new pistons after the cams, use a thinner head gasket it will raise it about a half a point depending on size, also get high compression valves from skunk2, they are good for .3 raise in compression... on their site it says to not use hc valves w/stage 2 and 3, well i contacted the tech support there and you can w/h22 only, plus the crowers are not quite as aggressive as the skunk2's are.