[lust4speed]

Originally Posted by mgarblik

...Not a hint of discoloration or burn off on the exhaust ports yet on either engine. My conclusion is the aluminum exhaust ports are not reaching the critical temperature to ruin the paint like the iron heads do...

Agree. Have about a half dozen engines with aluminum heads that I painted for club members and they all have survived without the blue burning off. Some are three or four years old and still holding up.