On Sun, 07 Jun 2009 16:31:00 -0500, Mike Spera
wrote:

What else causes temps to drift high? I know that shifting main bearings
can cause this, but I doubt the engine would continue to operate for
this long if this were the case. I do wonder though because the cold oil
pressure is right at redline on takeoff. After 5 minutes it goes back
down into the middle of the green.

Thoughts/theories?

After you've checked the usual suspects, I'd also check the nose bearing. I
had very similar symptoms in a Lyco IO360A1A that was due to leakage at
that point. However, after stabilization, the my oil pressure would also
be slightly low (still well within the green, but closer to the lower
margin).
--ron