When I put in my LT4 hotcam I only adjusted the rockers while manually turning the crank. It started up first try and has ran great ever since. I havent adjusted them with the motor running yet tho. It was really only like my second time ever adjusting valve trains so i am no pro at it. Do you think it would be worth it to try and adjust them with the motor running?? Is it alot more accurate doing it running or turning it by hand and doing it? Thanks, Dustin