Now deceased HP perfectionist and all around automotive performance guru, Bill Jenkins (Grumpy's Toy) dealt with this a lot when trying to tweak every once of HP out of every engine. He went so far as to paint the lite weight polished aluminum or chromed steel valve covers from the likes of Holley, Edelbrock, Moroso and the rest of them black because it dissipated heat faster than the polished or chromed jobs. In his ideal world, leave the stock factory painted valve covers on, get them far enough up from the head to be able to fix a girdle to the rocker arm studs to keep them as still as possible, and if need be because you're not good at welding, drill holes through them over each rocker arm and put a screw through them for the oil to fix to and drip down into the rocker arms as lubrication.
So when it comes to performance, is painted better than non-painted? Arguments can be made on both sides, to include protecting the metal from rust or oxidization.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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