Ok, i've run this eng up to 270 deg F. I think I've fried it. What are you guys thoughts?? the inside wall of the cylinder head has burned dis-coloring the darkest area is right below the exhaust. I have cleaned inside the head with degreaser. i cant feel any scaring with my finger on the walls.... I've jus been chasing needle settings. but every time she warms up a bit she wont start back up...