This has probably come up before, but I can't find it.  Why did OS drop the blue anodizing?  Was it an overheating issue?  I think they look good in blue.

I removed the coating so I could get consistent engine runs.

<I removed the coating so I could get consistent engine runs>

I'm not sure one has anything to do with the other. I have the blue job and it has been consistent ever since I installed the Randy Smith needle. A lot of race cars use dark colors on their engines to help disapate the heat.........Please explain.

I was using it on a profile plane.  First flight usually started out having to adjust the needle.  Each flight after it was adjust the nedle until about the third or fourth flight then it would stabilize.  I crock potted it to get rid of the coating.  Now it is fuel up, start engine and fly.  Unless big temp change in weather it is now consistent.  This is the LA .40 that used to be blue.  Maybe it was just an oddball engine.   My LA .46 which is still blue seems to be consistant in the P-39 which is partially cowled.  Both engines are box stock internally.