i have some questions, facts, and contridicting things lol.. first im lookin into the intense stage 3 cam, the first thing i wanna know is are bigger valves nessecary or will stock be sufficient, i do have well ported heads so that will help.. 2nd is i should be able to get away with using LS6 springs, but i would like more opinions and the reason i say "should" is that the LS6 cam is a .550 lift cam. now for the contridicting, intense site says for lobe lift its .338/.344 @ 1.6 = .540/.554 , well if you figure out it actually comes out to be .540/.550, and thats at 1.6 now in 99 or 00 i think they switch to 1.66 rockers on the L67 so that woulld be .561/.571 @1.66 ratio, so technically i could run those ls6 springs and be safe with a 1.6 rocker, but i have a 2001 so that puts me over, and some may think that ls6 spring wont work yes there 90lbs but thats whne the valve is closed when open there only 5lbs less then a 130 open.. i just want some more opinions, on all this info....thanx