The challenge wasn't they needed clearanced. When you look at them it looks like they'll clear until you bolt them on and put the rocker shafts on to set vash lash. They put everything on the install sheet but check the clearance. Just trying to put info out there for the next guy. I've been checking out the info on the Stealth heads for over a year and never saw a post on clearance problems. All and all they came out nice we'll see what the improvement is in two weeks at T&T. I'm really not trying to be negective about the heads.