Augg, now I'm really regreting selling that lq9 block but 2200 in profit is 2200 in profit. quick question, 4.3 crap sixes known to have exhaust leaks from the manifolds? I have a sound that sounds like lifters tapping but I know its not that, goes away when speeding up and smells like hot freakin exhaust underneath the truck and some times coming into the cab. Before I tear it off just wanted to know if they are known for leaking.