Senior Tech Team
Join Date: Sep 1998
Location: Mustang, OK USA
I need opinions on sealing head bolt threads
For MANY years I've used Permatex Liquid Teflon (in the plastic jar) to seal the threads of head bolts. I simply stuck the threads into the jar then immediately inserted the bolt through the head and screwed it into the block.
Well, today I picked up the 383 from the machine shop that is going in the 51 Chevy.
They told me to use RTV on the head bolt threads. I told them I've always used the liquid teflon. They said use the RTV. I asked WHICH RTV, Ultra copper, black, blue, which? They said it didn't matter, just use the RTV instead of the liquid teflon (which I've been using for at least 30yrs per recommendation of a previous machine shop).
So, from the professional engine shops, what's your recommendation for sealing head bolts???
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