Last year I had a fiasco with an
oil pressure problem. It would pull back from 52 to 45 from 4k to 6 k rpm. after numerours "experiments" including bypassing the
oil cooler / lines one thing was determined, the line sizes on the SPF are sufficient as I did not notice any difference in
oil pressure when the engine was hot with or without the oil cooler and lines. when cold there was a 5 psi difference with the oil cooler in the circuit. In the end the issue was a sloppy made Mellon oil pump. I got a blue printed oil pump off a guy in CA and voila oil pressure increased from 60 psig at 4 k to 66 psig at 6k rpm with 10W40. I eventually went to 10w30 which went from 60 psig at 4k to 63 psig at 6 k rpm. You might want to spend your money elsewhere.