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Low oil pressure from 351M

Discussion in 'The Hokey Ass Message Board' started by 56KUSTOM, Jun 30, 2012.

  1. I've had a few of these 351M motors in small mason dumps and pickups for work. A couple traits they all shared was they made very little power (2 bbl motors) and all had terrible oil pressure, a couple reading zero at idle on the factory gauge. I always tried a new oil pressure sending unit first which sometimes resulted in a little higher pressure on the gauge but in my experience never an acceptable reading. Second, an oil change and filter with thicker oil always seemed help a little. A ford mechanic once told me they had narrow main bearings which wore causing the low oil pressure readings. In their defense I never had one blow up and we ran em' loaded down pretty hard.
     

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