I need some expert advice. I have a 350 4 bolt main that I personally
rebuilt and installed in my truck. When I start it ,it has 60# + of oil
pressure but when I drive it a few miles (4-5) and stop at a red light or
something the oil pressure will drop to 0-10# when idling. As soon as I
accelerate it will shoot up to 40# and settle back to 25-30# when cruising
down the highway at 2000 rpm. It had a brand new Melling standard oil pump
that I have already replaced with another Melling standard oil pump. I have
never used one of these before. In the past I have always used Chevy oil
pumps and don't remember ever seeing this much pressure fluctuation and
those low of readings. Does anybody have any ideas what could be wrong? Is
this normal for Melling oil pumps? Should I replace it with a Chevy pump?
Could there be some other problem? I Plasticgaged the bearings when I
assembled it and everything was on the minimum side of the tolerances. Also
I am running 10W40 oil. Any help or suggestions would be appreciated. I
really am not looking forward to taking the engine out and completely
rebuilding it again just to try and find this problem. TIA>
Terry Stellman
1949 3600
Missouri City, Texas
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