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I'm trying to help a friend figure out this excessive oil pressure problem with his BBC. He had the motor built about 3 years ago and it's has maybe 40-50 hrs. on it. He claims that at the time of the rebuild he installed a standard pressure/high volume oil pump. The gauge on the dash shown almost 80 psi. when the engine is cold and then drops to to somewhere in the 70's once it warms up. He's getting oil seeping from the oil pan and distributor seal and we're thinking that it's because of the high pressure. We've already tried another sending unit and gauge and nothing changed. Hs engine setup consists of a dual remote oil filter head running 2 Fram HP1's, a 10 quart Hamburger oil pan and an oil cooler that's maybe like 10"-12" long and all the lines are -10 The oil he's running is Valvoline VR 20w50 Any ideas of what may be going on? I seem to think that with 12 quarts total, there isn't really a need for a cooler, but I could be wrong.
 

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my dads BBC has a constant 80 psi of oil pressure. My new to me SBC is around 70-80 psi. My olds is in the same 65-80 psi. My guess would be that the gaskets are bad.
 

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About the only seal that could be blown from oil pressure would be the oil filter seal. But I think the housing would burst before that.

Obviously the clearances are all good and the oil pump is blueprinted. So, MY suggestion would be to put gaskets in/on the motor and then quit spinning such thick oil. Drop to a racing 10/30. He is wasting HP with that thick of oil. He'll still have a ton of oil pressure and not have to waste HP pushing gear lube through the pump, filter, and all assorted clearances.
 

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I'm trying to help a friend figure out this excessive oil pressure problem with his BBC. He had the motor built about 3 years ago and it's has maybe 40-50 hrs. on it. He claims that at the time of the rebuild he installed a standard pressure/high volume oil pump. The gauge on the dash shown almost 80 psi. when the engine is cold and then drops to to somewhere in the 70's once it warms up. He's getting oil seeping from the oil pan and distributor seal and we're thinking that it's because of the high pressure. We've already tried another sending unit and gauge and nothing changed. Hs engine setup consists of a dual remote oil filter head running 2 Fram HP1's, a 10 quart Hamburger oil pan and an oil cooler that's maybe like 10"-12" long and all the lines are -10 The oil he's running is Valvoline VR 20w50 Any ideas of what may be going on? I seem to think that with 12 quarts total, there isn't really a need for a cooler, but I could be wrong.
Well for one, I ran a Hamburger pan before, and 2 spot welds on the bottem of the pan leaked...didnt discover that till I pulled the moter
allso what kind of breather system are you dealing with?
 

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About the only seal that could be blown from oil pressure would be the oil filter seal. But I think the housing would burst before that.

Obviously the clearances are all good and the oil pump is blueprinted. So, MY suggestion would be to put gaskets in/on the motor and then quit spinning such thick oil. Drop to a racing 10/30. He is wasting HP with that thick of oil. He'll still have a ton of oil pressure and not have to waste HP pushing gear lube through the pump, filter, and all assorted clearances.
X2, the leaks are not caused by oil pressure. Lack of breather maybe, but not oil pressure.
80 cold with 20/50 is not all that unusual, and you don't mention is the 70psi is at WOT or idling. Might consider changing to a 10/40, maybe a 10/30.



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