So, first time posting, been browsing for a couple months now! TONS of great, knowledgable people on here, I'm stumped on my current issue.
A couple months ago I bought 1973 F250 with a rebuilt 390 and it runs great, only 30k miles on rebuild. I use it as my daily driver. I've had a couple electrical problems that were easily fixed, other than that just flushing fluids and replacing filters.
Now, the weather is starting to warm up and I'm now seeing a new problem. I have an aftermarket oil pressure gauge installed by the previous owner. When I start my drive oil pressure is great, as the engine warms up the oil pressure drops but ONLY if I am idling. As soon as I hit the gas pedal, it goes right back up to normal level.
So my question is, since the car is running great, no strange sounds or knocking, is this a normal/ok behavior or a sign of something bad? Thanks,
my 390 has about 400 miles on it since rebuild, cold psi cruising is 55-65psi
cold idle 20 psi
warmed up in gear 4psi, put in nuetral and goes to about 9psi, no noise, no issues clean oil, jump right back up at touch of throttle
using melling high volumn pump, also have the holley jets in oil passage to help slow flow to upper end, crank is turned .010/.010 on mains and rods
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