I was advised by a member to use VHF coatings on my headers. I did and was very impressed with the results.
Here is a link to when I did them, and a photo of them today.
I have put lots of heat through them. Its about 16 bucks a can up here.
Hope this gives some insight.
My header paint is here.
http://67-72chevytrucks.com/vboard/s...=503247&page=9