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We added jet hot coating to my headers and mid section this winter because the ls7 was generating a lot of heat on the track. We felt that the oil lines were too close to the headers to be comfortable with continuing with heat wrap and the inside tunnel was extremely hot so we sent everything out for extreme coating.
Jet hot located in PA returned my headers on schedule within the 10 days they stated which was nice.
Last weekend at NJMP I did some temp checks against another header on a 346 H/C car with headers.
After we got in the garages I checked my temps and then the uncoated headers temp. I found my temps to be a bit over 200 degrees cooler (180 vs 380).
I also noticed that my temps would drop faster than the uncoated headers while we sat there. This was good news but threw off my initial testing because from the end of the session to the garage I was dropping faster so I don't know what my high temp was compared to the high temp of the uncoated.
We will be at WGI next month and I want to do more testing, but for now I am very happy. The coating is also very shiny so I wonder how long that will hold up.
I put the Jet Coated headers on my vert almost 4 years ago. Never had a a chance to check before and after temps, tho. Thanks for the post, now I know about how much cooler things are.