Ok so iv recently had to rebuild my motor. (still waiting on head) When i tore it down it was bone stock and looks like the rings were pretty bad I sent my cylinder off to alba raceing to get it bored and get an 11:1 comp cp piston. I have also orderd a stage one hot cam. But now the guy that I got my head done at said that 3 of my valves and 2 springs were shot. How much would all this affect performance? and will I see a big power difference with pretty much everything working good and new? Also how hard is it to port and polish? Iv tried in on some of my chainsaws and it gave them quite a bit of power. But just wanted to see how hard the raptor would be to do.