I recently had my 400 bored 30 over to make a 406 ci for racing. It has new bearings throughout splayed 4 bolt main caps, steel crank, new cam, valve springs, pushrods, high volume oil pump and new oil pan. I had great oil pressure at start up around 40 psi at idle 1000 rpm. I raced in a 25 lap race on a 3/8 mile oval track and as the race went on the oil pressure dropped at idle it was 20 psi and while racing only 50 psi at 6300 rpm. I noticed while scrubbing tires going right and left when I would turn right the psi would drop near 0. I haven't checked anything yet it's actually still on the trailer. Does anyone have any suggestions. I have read a few posts that indicate a oil filter bypass, is this something I should look at or am I doomed for new bearings.
Thanks