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Definitley change it if you can.
I would add something better. LT1 have a bit low oil pressure. With a stock pan you want to stay away from the real DH/high volume units, don't want to risk sucking the pan dry, but there are units that are slightly better then stock that will give you a touch better oil pressure.
A) You can use a stock pump but install the GM white spring. This will give you a bit more pressure. * Note that although GM list it as 70 PSI, you most likely aren't going to see that high a pressure with the miles you have on the car.
Below is the into on the GM White spring:
Oil Pump Spring (3848911)
Oil Pressure in small-block and V6/90º Chevrolet engines is regulated by a spring in the oil pump cover. This spring (color-coded white) produces approximately 70 psi oil pressure. Small Image Technical Notes: Used in high-performance oil pump P/N 3848907. Minimum recommended oil pressure for off-highway use is 65 psi at engine operating speed.
GM LIST: $3.91
GM Parts Direct: $2.32 + S&H
B) Look into a Melling SELECT M155 pump (not the 155HV, that's too much for a stock pan ). they make two versions, the SELECT is an upgraded unit. Make sure you get the pump that matches your pickup tube size, 95/96 GM switched.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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Oil pump???
