So you paint it on with a brush? Sorry I just can't picture this?

This is sorta exciting. I do recall 1995SSEi(I think his name is Joe) saying something about heat soaking the engine by insulation the exhaust pipes too much.... I guess we'll find out. Subscribed!

Ever done any PVC gluing? Same type of applicator. I assume, anyway. I'll know on Thursday when it gets here.

I'm very interested in your results too! I want to clean up my manifolds, but I won't be painting them like I did before.

Oh great... Now he'* making us wait it out in suspense.

PVC glue type applicator? That sounds like it will take a painful amount of time to apply.

Actually, I think it'll be quite easy.

I tracked the shipment. It'll be Thursday.

Sounds very interesting....Is it too much to ask you to document the process and findings? It seems like you're the type in the first place; I'm just respectfully requesting you to do so.

-IKZ

I will take temps before and after at warm idle. 1" above the front collector. The process? Wire brush off the loose scale, and paint it on.

This seems strange to me. I do not understand why this coating would be black. Black objects have higher emissivity and therefore radiate more heat. I would think you would want a shiny light colored coating if you don't want to radiate heat out from the headers. I even remember being told that this is why stainless exhaust is good; the shiny surface finish radiates less heat, keeping the exhaust gas hot and flowing at higher velocities (as willwren said). I wonder what they used to measure the temperature; some infrared temperature guns are quite sensitive to the surface type and can read different for black vs shiny surface. Although I thought most tend to read too low for shiny surfaces...

Chinski, do an internet search on 'black body'.

You want your exhaust to hold heat NEAR the heads to increase velocity. Shiny surfaces are generally only an issue where LIGHT is involved. Not necessarily heat.