hi
had my USED headers jet hot coated , inside and out , 8 years and still look good .
also much lower engine compartment temps !
I've been at this game for 50+ years the last 25 owning and operating a classic car repair / resto business. my local machinist was quite curious at to what coating was on the headers of a BB old's he had just Dynoed. I asked why the curiosity? he said he had never seen set of coated headers maintain their coating after a break in and x number of dyno pulls. I answered Jet Hot
