I have a set of sr20 heads that are ported. The intake runners have been ported into four of the head studs. They have brass tubes in them. I cant remember which four cylinders have them. I want to silicone the head bolt washers but not sure which ones to do?

On my BMF 385 heads, i have the same thing and it is not an issue. Since there is a thin layer of epoxy over the tubes on the wall of the runner on the intakes. The tubes aren't loose in there are they?