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Thanks FennLane, this is good info. Strange that I didn't find much discussion about coated head studs with the usual Googling. After speaking with Whitford, they advised that several of the automotive OEM's in recent years have used Xylan or similar fluoropolymers to fix certain head warping...

Thanks Cory, I'll be talking to Whitford this morning about the application and will update the thread with any useful information.

Curious if anyone has experimented with using Xylan coated studs in aluminum engine blocks? Particularly as head studs? Steel studs set into aluminum blocks are nearly always troublesome to remove after many years of use, and many times will take the aluminum threads with them on extraction...