I guess I need to find the N key as in INTAKE before posting. I have a NEW pair of iron Grumpy heads that have been heavily ported, they flow 400/389. They are brand new heads and have never had seats or guides done when I bought them. I'm sure they have been around for ten years. There are tubes installed in the head bolt locations into two ports on each head. The porting has gone into the pushrod Holes on two ports on each head. these are not the round pushrod holes, they arent going to be able to be tubed. My question is what kind of epoxy can be used and does anyone have much experience or advise on epoxy work in intake ports?? Thanks in advance.