Gois I need your opinion

haha 9gag cats xD

It's a picture. Has nothing to do with the question I'm asking.

i would just do a teardown
you are going to find some shit.
throw on some better heads and intake while its open, and a cam

Yeah I've considered doing a tear down but it really doesn't need one. It's a newer engine that only had 63k at the time it was removed. The only thing wrong with it is the time it sat. Honestly after we got it running it ran like a fucking champ for about 30 minutes that's when it started losing oil pressure. Now it will only run for about a minute at a time before it loses it but up until then it will stick around 50PSI. That's what makes me think the pressure regulator is getting stuck open.

>>15576357
running it at 0 psi damaged something
maybe a cam bearing
you never know what caused it until you do it. maybe cut open the oil filter and check for metal shit in it

Already did. Running at 0 doesn't destroy something if it's only running like that for a few seconds. No metal what so ever if there was I wouldn't even be here asking this id be crying and pulling the engine. The engine makes 0 noise when it has pressure then when it starts to lose pressure you can hear the lifters but that's it.

Drop the pan and see what it looks like.

Low/no oil pressure is only cause by a few things really.
Low oil supply either due to a blockage or lack of oil
Massive leak in pressure system(like an oil feed line on a turbo car os something akin to that)
Loose bearings
Or a failing oil pump. Which almost never happens
If it builds good pressure being run manually, it's likely bearings bruh.
Once the oil/engine warms up, oil thins out, things expand, causing little to no pressure

I can't drop the oil pan without pulling the engine. It's a 1988 mustang with a 5.0 it's got that stupid twin drain oil pan with a huge hump in it. Also I don't think it's the bearings I think it's a blockage. I think it's picking up sludge because the engine sat for 7 years with the same oil in it. I think this is worth a try though before pulling the engine don't you guys?