05-05-2009, 06:21 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
I'm sure different engines and pumps have different prv setpoints. I know my 5.0/347 oil pressure holds steady at 60 psi at idle cold and drops to 40 psi hot. I have never seen it go above 60 psi hot or cold at any rpm. The pressure is proportional to rpm until it hits 60 psi. I would guess that the prv is higher than 60 psi since the oil pressure sending unit is a fair ways down stream of the pump, but I am fairly certain that the prv is limitting the pressure. I have ran both 10w-30w and 10w-40w. The 10w-30w was more like 50 psi at a cold idle. I have thought about going back to the lighter oil to take load off the distributor gear, but I like the heavier oil for the cast pistons.
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