Not relative to your post on the small oil pressure loss at the upper RPM, I have seen a 8 HP gain on a wedge motor letting the oil temps go from 130F to 160F Ended up switching all my street builds to either 5W20Wt or 0W20 wt. Valvoline standard oil, not synthetic, and saw no gain or loss of HP going from 80F up to 220F oil temps
Cab, what is the lightest oil you have succesfully run in a big block, say over 800 hp and over 7000 rpm? I assume bearing clearances would be tighter?
