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I'll cut the filter open but I took belly pan off last night to put in new oil pump and I didn't see any steel.

No metal in the pan is a good sign. What oil are you running?

40 weight, when i took of intake manifold i notieced a loose push rod, could loose push rods be messing up oil pressure?

I was able to get the valve cover off with exhasue manifold still on so i am going to start the motor and adjust valves while running, the zero lash and half turn must have not done it properly, plus a lifter could have collapsed

A loose pushrod wouldn't do it. Readjusting them isn't going to make a difference either.

Quote:

Originally Posted by pantera232 (Post 3391265)

Yes mechanical and electric are both the same, i read about the ones under cam sprocket today and intake that is our next step.. Appreciate all the help guys...
The motor is a generation 6 with morel lifters and new pushrods.

The motor has only ran on a trailer 4 times now for 5 min sessions mainly cheacking this issure.
The boat is not in the water so there cant me cavitations issues, motor is basically level
The original oil pump was damn near laying on the bottom of pan, we riased it up a **** hair (3/8) lol and re shaped pan a bit..Again original pump ran like a bat out of hell before rebuild.
We checked main tolerances when installing but they were fine before we rebuilt anyway. Motor only cam out to get new head and cam , but then said **** it and bored it .030 and through domed pistons in it with cometic gaskets .027 I think to got 9.3:1 compression. Has new timing chains thats why i cant see it missing oil galley plugs but well see, any one have pics of these plugs???????????/? thanks Adam

What exactly do you mean by "raised it up a bit"? The Pick-up should be approx 3/8" off the bottom of the pan and should be perfectly square with the bottom as well.

"reshaped the Pan a bit"??????:eek:

How much oil do you have in it? Too much oil can make it have low Oil Pressure as well as not having enough

You stated this was originally a 330. Was there such a thing as a 330 gen 6? Is this carb or fuel injection? Also see you have 781 heads which are mark lV heads.

Eliminator28, you stated that too much oil can make it have low oil pressure. Can you elaborate on this.

Quote:

Originally Posted by picklenjim (Post 3392925)

The crank will hit the oil if the level it too high and can create air voids in the pan for the pump to suck up. This would be erratic OP though not consistently low. Unless done enough to take out the mains, then consistently low.

I've never had it happen to me, but I think a bad lifter could create a major internal oil leak.

Just saw this, sorry I cant be of much help when it comes to BB stuff, especially oil pressure issues. I agree though to check the pickup height, and reshaping of the pan?? When you say 40 weight, is it straight 40, or like a 15w40 rotella?

Quote:

Originally Posted by picklenjim (Post 3392925)

Like Blue Thunder said.. With the oil level too high the crank counterweights hitting the oil will airate it, making OP eratic.

IMHO, I would take a few steps back at this point and go back to triple checking bearing clearances on the mains and rods. You are looking for a simple smoking gun and not finding it. I know you want to be in the water tomorrow, but it will be easier to find the problem by checking all the what if's now rather than blowing it up later. Just my .02