Barry's right. One thing that I try before machining is to put a bead of ultra-copper RTV between the manifolds and the gasket to the head. Bolt on and tighten, then let set for 24 hours allowing the RTV to cure. In most cases this fix works, I've gotten to where I don't put a manifold set on the inline six without it.


Fred
52 3600
69 C-10