Pollo432

iTrader: (21)

Ok guy so a couple months ago I installed a forged 370 from a local engine builder. Ran the truck for about a week and it started loosing oil pressure. Changed oil and found cooper metal flakes in the oil pan. Cleaned pick up tube screen and put everything back together added thicker oil. Still no oil pressure, so parked the truck. Today I took the engine out. Tore it apart but could find nothing wrong. I have it tore down to the short block and can't see anything wrong except the oil pump is a little tight to turn. Any ideas would be greatful. Truck is turbo'd can't see anything wrong with the turbo.

ls1 1990 VN

Whats wrong! Is it possible the local engine builder is not LS savvy, bearings now trash?

Pollo432

iTrader: (21)

I doubt it. He's pushed a couple of guys into the 10s in 4600lb trucks. Careless? Possible. I will tear down further in the AM.

Pollo432

iTrader: (21)

I will take main caps and rod caps in the morning and check back.

ls1 1990 VN

You say he's pushed a couple of guys into the 10s....You didn't say they were LS powered & he had built them the motors

Pollo432

iTrader: (21)

Yes LS motors. And he's a one man operation, I'm pretty sure he built the engines.

Gray86hatch

iTrader: (83)

Check the thrust of the crank first

Tim

Pollo432

iTrader: (21)

How much should the thrust be. It shouldn't move much correct?

JakeFusion

iTrader: (7)

+2 on the thrust. That happens even to the best builders sometimes.

Pollo432

iTrader: (21)

Thrust is nice and tight. I can't see any issues with the short block. It spins good no visible damage. All bearings seem to be in tact. Would hate to rear down short block and nothing is wrong.

JakeFusion

iTrader: (7)

Was the o-ring pinched in the oil pump? If so, that would show up as low oil pressure. And the flakes would be bearings starved for oil.

Pollo432

iTrader: (21)

O-ring looked good. Ill give it a one over. Got called in to work. Once I get back ill tear into the mains.

RockinWs6

You sure all the oil gallery plugs are in place and didn't move? Cam bearing walk? Relief valve in oil pump stuck open?

The_Bishop

iTrader: (10)

Cam bearings?

Pollo432

iTrader: (21)

That was my first guess but after pulling the cam, bearings look fine slight scratches but nothing serious. Cam looks good.

Pollo432

iTrader: (21)

Mains are toast. I'm goin to blame it on the oil pump. Seems like it wants to lock up.

Gray86hatch

iTrader: (83)

Was the pump aligned when it was installed.

Tim

Pollo432

iTrader: (21)

Yes it was.

Pollo432

iTrader: (21)

Melling high pressure, break in with 5-30 and then tried 15-40

Burken01

iTrader: (88)

I don't like seeing stuff like this especially since im a few weeks out on starting my new engine..

Sorry to see this..

What does your engine guy think?