I don't like to use sealer on studs or bolts, I think it is best to have clean threads on the bolt and in the block then use a little assembly lube or just plain oil. On blocks that the threads go into the cooling jackets (scrubs) I use a little block sealer (we have cubes that I put into the water jackets before installing the expansion plugs) and always start a fresh engine with water, no coolant untill everything is ran-in and adjusted and ready for the road. If you get a little seapage it usally stops after a few minutes running.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias