Too me it's odd that it's dropping down so far when hot. What is the oil pressure like when cold and first start. What's of concern is that it has excellent pressure when you bring RPM's up. With your gauge plumbed at the oil filter housing, your monitoring the oil pump and bypass on oil filter housing. One thing I would really like you to do is remove your oil filter housing and check the bypass. It has a tiny screw that holes the spring and flat disc. I usually stretch this spring a bit to put a little more tension on the disc to hole it close. I'm curious if the spring tension on the disc is allowing it too open. Then the other issue could be the check ball in the oil pump, stuck open some allowing bypass oil. I'm think the oil pump. Engine sounds really good in video.
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 10.12@133 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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