I was searching the archives and came upon a thread that discussed using a longer belt such as a 9.5 or 10 x 750 belt, slowing the fan slightly for reduced parasitic loss. 7hp @ 5500rpm was claimed.
Mufflers and clever HP gains
Here in Michigan, the highest I've ever seen my oil temperature was just under 210 degrees. This was on a 3 hr trip in 90+ degree humid weather with the A/C on. On a cooler day at the track, I never even reached 200. I think I could get away with this here, where the climate is cooler most of the year.
Does anyone have any experience or comments on increased head, cylinder, or oil temperatures?