Not to highjack this thread but - Cab what is your beef against "right stuff gasket maker". It worked great for me but I'm not a pro mechanic, just a hobbyist . I finally got my valve covers to seal. I tried 5 other "gasket" ways as suggested here all leaked. Solution - no gasket and Right Stuff. These were 516 heads with the angled bolt holes and cast valve covers though.

My engine was assembled by a pro who has done thousands. Pan gasket always dripped a little. Solution was Right Stuff. It probably would have sealed using regular "gasket" way too.

Draw back I see with it is you only have 5-10 min max to get it all assembled. And with windage tray and engine in the car, that is a challenge. Because there is a lot of length to spread the sealer, it starts setting up and when you finally start to assemble, it doesn't squeeze out same as RTV. It acts more like having an o-ring seal.