Little side note about exhaust port "burnoff" I recently painted 2 Pontiac engines with aluminum heads. One is an Iron block and Edelbrock aluminum heads. The other is an aluminum block and Kauffman highports. The iron block is painted with DE1610 Dupli Color rattle cans. The all aluminum one with DE 1616 Duplicolor Rattle cans. Both have been through multiple dyno sessions and the one with DE 1610 has about 700 street miles on it. 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. Typically, iron heads have the paint burning to white or flaking off after 2-3 hours of operation. Your results may vary.
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