crazy idea

I've seen cast iron manifolds glow cherry red and orange from engines being out of tune. It takes over 1000 degrees F to do that.

I agree, way higher temps than posted above . I have plastic hood vents in my fiberglass hood, on each side of the 6 pack scoop, the one on the pass side is starting to melt ? Big engine in a tite space. Have my cooling problem whipped , and tune is close to spot on----------
Didn`t do it with header wrap, but does now w/o it !! I hate the dam wrap !!
Guess I really need a new set of thermally coated headers>$$$