258 warm idle oil presure

[donnyeagle]

I have heard that the AMC 258 is known for low oil pressure. Just wondering if it's true.

[donnyeagle]

I'm running a NAPA oil filter, Rotella 15-40 and mechanical gauge.

[mudkicker715]

I have 2 strokers. so that means the oil pressure from the critical areas remains the same. head and lifters do not affect it so much. oil filter maybe never experienced it. i went through different brands. and i use a mechanical gauge.

i get at idle ca. 25 psi warm 45 to 55 psi warm highway. so this 3 psi holy crap. my concord old terrible rebiuld on it gets 15 psi warm idle. another mechanical gauge.

3psi would worry me

[carnuck]

Depends on the oil you run. It's flow that is more important that actual pressure. Fram filters have a habit of imploding and blocking oil galleries and killing motors (I have photos of the crud I back flushed from my 460 in the '91 E350 I had that ONLY ran factory and Fram filters from new.)

[Still Pat]

Mine runs right at to just over 20 warm idle. Brandon said he had a rebuilt engine installed approximately (speedometer inop.) 15 - 20 thousand miles ago. I am running a mechanical gauge also.

[Billman]

I get 0-3 after it warms up along with a bit of smoke out the tailpipe.  Tried a different oil pump and it didn't help. Car is sitting because of it. I've got a long block with 100k on it and a 4.0 head to put in when I get the time

[vangremlin]

The 1981 Service manual says that normal operating oil pressure at 600 rpm should be 13 psi, and 37-75 at 1600+ rpm