Why would a motor need 75 psi at cruise. High psi equals lost HP. I thought the objective was just enough oil to lube bearings, cool bearings, pump hyd lifters if you have them, feed oil to rockers...
In testing (actual testing) the difference between 70 psi and 50 psi oil pressure is 5 HP on a good day. That is it.
Now here is a real bender. We have lowered oil pressure and LOST HP...sometimes as much as 12-15. So to just say someone has too much oil pressure is incorrect. I will tell you I don't like any Chrysler V-8 to have less than 40 psi HOT idle and IDC if it's 100 at WOT. It won't hurt a thing.
There are piles of scrapped rockers and shafts because of low oil pressure and because guys want to spin them up and not INCREASE oil to the top end. Chrylser oil timing (for the mains and the rockers) is fairly straight forward but has quirks. Maybe I should write a sticky of what to do and not do because I see mostly incorrect stuff i.e. putting that stupid crossover tube in the lifter valley (waste of time...at best does nothing...worst case..decreases oil at the mains) and not increasing the diameter of ALL oil feed holes.
