Block casting paint!? Yeah! That's the ticket! It's a well known fact that painted aluminum dissipates heat faster. Just lazy. I wasn't going to media blast it for fear of getting grit in the wrong holes, and I didn't feel the need to pretty it up for it's one and only photo op... How long would it stay that way if I had taken it back to factory? 5000 miles? I DID blast stuff like the timing case cover, oil pan, and they are covered with grit. I threw this is the parts washer overnight and will scrub the hell out it in the morning.