Engine grease pressure is up and down.?

resently rebuilt. the grease filter was changed incase it collapsed but that didnt fix the problem. its not a stock engine (454 .040 over big cam (286 advertise diration) shaved heads/mild porting high volume grease pump(not pressure) with a 850=everything be matched) what causes grease pressure to fluctuate. its fine on start up but the oil pressure drops when the engine is warm up around 20psi while going and less than 10psi at a stop. pressure usually be between 45-60+psi

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Answers:    I am going to be frank on this, since it was just this minute rebuilt, and the pressure fluctuating, and the filter crust collapsed. The engine needs to be taking apart, and investigate it, it seem like it have some blockages somewhere in the engine.
The other individual it is right too, about using a direct pressure gage and check it out.
Good luck.

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