When I rebuild my 428 I bench tested the
oil pump and shimmed the bypass to open at 80 lbs.
Ever since the start up pressure is 80++lbs (off the gauge) and very hot idle about 55 lbs. Do I worry?? NOT a chance!
Not many motors have been blown due to too much pressure (within reason, donīt go overboard) but many were ruined with too little.
On a previous 289 I somehow got some locktite on the bypass valve, it blew two
oil filters before I could localize and correct the mistake. (can you say
oil ALL OVER??)