Re: Stock or later oil pump?
Have a photo of your pump? Is it the long nose style or the round pick-up with the screen. If the round pick up I would suggest you stay with it,if the pump is good. What was the oil pressure before removing the engine? If the pressure was low that is not a sign the pump is always bad, but if it was good pressure, I would say the pump is good. The later style pumps with 80# pressure and high volume can create problems with leaks out the rear main.
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