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which one? Intake or exhaust manifolds? I powder coated my exhaust manifolds and painted my aluminum qjet intake. i painted it cast aluminum because i wanted to keep the clean cast look.
Yes - painted the intake with high temp chevy orange.
No - on the exhaust manifold used Calyx manifold dressing (http://calyxmanifold.com/) - wasn't removing the manifolds, the dressing can be applied with your hands.
i used a temp gun on my exhaust headers just yesterday and the temps were just a little over 500 degrees on most tubes right out of the heads so pick a paint or coating at that degree will probably last awhile.
If i have to touch up sometimes i just spray a rattle can flat black on it and let it burn on and cool down a couple of times and it sticks a good while but I think nothing will last forever.
If its the intake then just go to Autozone, Oreilys or what ever your brand is and pick up some engine spray paint in a rattle can and put on about 3 coats, first a dusting , second cover all then third pull back and give a good solid coat and let dry, put about 5 mins in between coats and a good day or so before you put it on.
Do it, you'll be glad you did. While I didn't do my whole engine, the intake manifold is a much more prominant piece that you'll see when you open up the hood. I couldn't stand the sight of mine now that I had cleaned up most everything else. I had the carb off to be refinished so it was the perfect time.
Went from this:
to this:
I just used Rustoleum Engine Enamel 500F for primer and paint.