I keep having the problem with running lean. From what I can tell the intake bolts keep loosening up which I read is normal. The problem is when I go to retighten them I get one or two that spin and will not tighten. After looking at the threads I see that the bolt is not engaging the thread on heads. Its like the threads on the head are helicoiled in (which it might have been I bought them used) and then come out after trying to tighten the bolts. I was wondering if I would run into any problems using studs in the heads and then just use flange nuts on the lower intake to secure it.