Please explain why you put sealer on the intake BOLTS? I've heard of this, but never have I seen it in actual practice. We often get engines in "loaded up" with bubba-cone (vernacular for RTV). Never quite understood it.
Agreed, if you must use RTV, "Ultra-Black" is the best stuff for engines. Drops in the corners where gaskets and parts "meet" is all we use. Occasionally, we'll use it on the "ends" of the intakes for small blocks. Usually, we use the
peel and stick" gasket that comes with the Felpro Performance stuff, and a drop of RTV in the corners. No leaks.
For sealing bolt threads, RTV is too thick. It will alter your torque readings. We use Permatex "Aviation". Super 300 and "Indian Head" are similar. You brush on a TINY bit in the threads. You still get accurate torque readings AND no leaks.
When it comes to sealants, if a little is enough, a lot is NOT better. Where two machined surfaces come together, a paper gasket "dry" is far and away the most effective method of sealing.
We've rebuilt several over the years where the bearings or oil pump were "taken out" by excessive RTV in the system.