Alrighty. I've asked this a few times before, I have more info now. CHEVY 350 K1500. 1993. Replaced intake gaskets, (bad oil leak) dropped a small amount of coolant in with oil while doing so. Changed oil before starting truck. Since then the pressure will read fine while cold, but as the truck warms up, the pressure drops, eventually all the way to zero, and will stall the truck at idle. I've replaced Sending Unit, Oil Pump, Oil Screen, Cam Bearings, Mains/Rods Bearings. and about 5 oil changes. Mechanical gauge reads about 40 psi at idle when cold, 15 when warm. While shifting into reverse it drops to about 11, and drive drops to 13psi. The levels seem alright, but the gauge still acts as described. When I switch gears, especially into reverse, the ropm will drop off to about 150-200, the truck barely staying running, then slowly fluctuates up to about 600. I'm stuck.. Anybody.. with ANY pointers at all? :(

we used a a small wire brush on a drill, and layed paper towel out to try collecting everything that fell, not a sanding disc. Yes, I am reading the levels with a mechanical gauge, and I've replaced Cams, Mains, and Rods. So yes, pretty well all bearings.

The specs are okay, but I've recently installed a high output/high volume oil pump, so specs shouldn't be that low, should they?

I may have over-tourqued my valves when I placed them back in, so that might be the idle problem.. either that or has to do with the oil pressure problem that still isn't fixed. we used a a small wire brush on a drill, and layed paper towel out to try collecting everything that fell, not a sanding disc. Yes, I am reading the levels with a mechanical gauge, and I've replaced Cams, Mains, and Rods. So yes, pretty well all bearings. The specs are okay, but I've recently installed a high output/high volume oil pump, so specs shouldn't be that low, should they? I may have over-tourqued my valves when I placed them back in, so that might be the idle problem.. either that or has to do with the oil pressure problem that still isn't fixed.

did you plastigauge the bearings when installing? you have too much clearance on mains or you damaged a cam bearing when installing. what kind of oil filter are you running? I have seen cheap filters cause oil pressure problems before did you plastigauge the bearings when installing? you have too much clearance on mains or you damaged a cam bearing when installing. what kind of oil filter are you running? I have seen cheap filters cause oil pressure problems before