I've noticed a lot of people paint their Offy or Clifford aluminum manifold engine color. I always thought this was a stylistic choice to make it look more like the stock setup, even tho they are dressing up the rest of the engine. But then I just had a thought that maybe this is done to help the manifold heat issue with an inline. The bare aluminum will transfer heat out faster, so maybe it is better to use the Chevy Orange, or in my case GM corporate blue, to give the manifold a little more insulation. Am I off base in this assumption, or is this helpful? I know GM switched over to painting engines black because of its thermal properties in the '80s, switching away from colored engines for this reason.