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Loosing oil pressure

(1998 Chevrolet 2500 Pickup)
in Girard, OH on May 19, 2009
had a 5.7 motor blew replaced it with 5.0 crate motor nothing leaks everthing look fine changed 10 of these never had a problem.normal at startup but falls quickly changed oil pump.
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Popular Answer
on May 22, 2009
Do the oil pans and pick up tubes match with the 5.7 and 5.0? Are you verifying the loss of oil pressure with a manual oil testing gauge or are you using the dash gauge which could be off or the sending unit is bad etc? These are GM crate motors?
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