New and in need of help

I just learned the other day that the four outermost exhaust manifold bolts, the one on each end on each head, are supposed to be studs and they go into a water channel. The other four bolts are bolts and don't need sealing.

Also, the studs should have specialthick, conical washers, at least for the original exhaust manifolds.

I hope I'm right, I am in no ways an expert but I heard it from a pro.