I have a FD road racecar.
the eng its a n/a bridgeport done w/FD irons, s4 rotors, webber 51 carb, RB intake & header. its making 240whp
how ever I have come to trouble. everytime I rev up, the oilpress goes down to about 40-50 psi.
I have changed everything from the esentric shaft, oil pump, I have pressed the the rear regulator, put a little nut on the front cover spring, changed the o´ring,........

do you have any ideas on what can be happening?