I'm trying to find out the max acceptable heat/temp I can expose pushrods and/or rockers to, without damaging them.
It is known that the 4.0L-OHV has poor top end / valve train oiling; often leading to premature wear of pushrod ends and pushrod cups in the rockers. So, I thought I would try using a dry-film lubricant engine coating.
http://www.techlinecoatings.com/hi-performance/bs-internal-engine-coatings.html
I'm looking at the DFL-1 PowerKote:
My concern is the 300deg, for 1 hour. Does anybody see any problems with this; such as loss of "temper", unintended hardening/embrittlement, and/or warpage of the parts? As I said, I intend to use it on the pushrods, the inside "bore" and both the pushrod cup as well as the valve end tip...