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Fresh rebuild on a Mopar 360.

859 Views 21 Replies 11 Participants Last post by  RevboxRyan
Fresh rebuild on a 360 we primed it had 50psi of oil pressure. Fired it up 70psi breaking it in a 2000 rpm oil pressure slowly dropping 10 minutes in down to 25psi after 20 minutes down to bout 10psi at 2000rpm back it down to 800rpm and it’s got bout 2psi shut it down. Drained the oil checked the filter nothing that goes that’s why. Any help would be greatly appreciated.
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With the oil pressure starting high and then dwindling down low would make me start looking at the bypass valve in the oil pump or the pickup tube at the base or at the screen because if it were a galley plug (and I ain't sayin that it ain't) then you should have low pressure right off the get go. There could also be some crud in a galley somewhere but I would certainly look at the oil and filter and even pull a rod and main cap off because the engine could also be eating a bearing. All bearings are technically responsible for oil pressure including the cam bearings. You can have a destroyed cam but with good journals and you'll have oil pressure. Hydraulic lifters are also responsible for oil pressure. Are they not pressurising or holding pressure? Did they move up and down and spin freely by hand in their lifter bores? Did you check this upon assembly?
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Verify that guage is good I just did a 360 magnum for a Dart and the little 2 inch or what ever oil pressure guage was like 10 or 12 psi low
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