When I ran all bolts on my headers I used silver antisieze.I run it on all 6 vehicles that and do have headers.Ive never had a leak.I run studs on my 440 now except for 2 that have to be bolts.My kids 413 has been together for 8 years with headers and bolts.Never leaks a drop and the bolts come right out.Ive also ran the same on 5 small blocks.Rocky