How much do i need to mill my intake manifold? My heads are milled .030". How much do i need to take off and where, the bottom, sides or both and how much? Thanks. I am having a problem with water in my oil and i think thats where its at.
You don’t need to mill it at all with .030 off the heads. All that was required with mine was to elongate (widen) the boltholes towards the center of the manifold. I used RTV silicone along with the gaskets for the port surfaces themselves and used only RTV instead of the end gaskets.
Drove it for a year and a half after that and it didn't leak a drop.