Rb30(26)dett Head Porting

[TriniGT]

Don't remove the stud lumps...just improve their shape by getting rid of the sharp bump on the inner edge and lowering the height. If you remove it you will end up damaging the head.

Where did you get that from? I have seen many exhaust side heads and they have removed the lump. The fact that the exhaust manifold doesn't have the lump should alone indicate that it should be alright to remove the lump, I can't see it making the head any weaker, please enlighten me, is this from experience?

[The Dan]

Where did you get that from? I have seen many exhaust side heads and they have removed the lump. The fact that the exhaust manifold doesn't have the lump should alone indicate that it should be alright to remove the lump, I can't see it making the head any weaker, please enlighten me, is this from experience?

No, it's a completely uneducated guess.

Of course it will weaken the head. The amount of material around the stud area is adequate to hold the weight of the manifold/turbo/exhaust etc. When you reduce the material it means there will be less support for the manifold studs. Not to say that it will break but you put a GT35R on it with a stainless manifold and you can bet it will crack through.