if all you have is a port and polished and a valve worked head with a skunk2 manifold,your not making 180 hp on an all motor ls,why have you messed with cam timing if you arent on a dyno,you might be losing power if you havent been able to see whats going on with the car when you adjust the cam gears, my suggestion,wait till you get on a dyno to tune the car and make any adjustments......and like i said before,if all you have is a head with some p and p and i am assuming your using stock ls cams and stock ls bottom end, prepare yourself to be dissapointed,cause you wont be making 180......