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Return to Parts List Category : D- Big Block (Low Deck) : Oiling System : Miscellaneous MIL 21550 OIL PSI REGULATOR (EXT ADJ) WORKS GREAT FOR SETTING BIG BLOCK OIL PRESSURE $64.95 Stainless Steel, Adjustable, External Oil Pressure Regulator, Spring-Activated It allows you to adjust the oil pump pressure without removing the oil pan or the oiling system. CHRYSLER OIL PRESSURE REGULATOR Permits adjustment of oil pressure externally even when the engine is running, a very valuable asset for dialing-in desired oil pressure. Ideal for compensating for low oil pressure on street application or excessively high oil pressure on the track (more than 75 PSI hot is usually unnecessary and uses wasted horsepower to drive).