06cobaltindallas

ok i ran into an idea that i thought would be cool to try and possibly help cool the engine temperature down a bit. If i were to powdercoat the cylinder head and engine, would i have to powdercoat the head first if i were going to get it ported or could i still do it after. A website i came across said something like if i were to powdercoat the ports that it would drop temps.
thanks