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The vans have a good amount of room between the pan and crossmember even with the 5qt pan. Enough room that the pan drops out fairly easily.
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The PF932 2qt C60 truck filter works well on these vans provided they do not have the engine oil cooler adapter. The long filter uses 2x the filter media and will not open the bypass as long on a cold start, which filters the oil better by allowing less unfiltered oil to circulate.Most Chevy small blocks use 5 quarts of oil for a complete fill. The filters back in the earlier years would hold almost a quart. What I do on my 5.7s, which I use the AC PF1218 filter on, is fill the filter with fresh oil. Most of the time this is about 3/4 of a quart. Both my trucks have the towing package with external oil cooler; that increases the capacity a little bit. So I have a 5 quart jug of oil, that goes in the fill hole once the new filter is installed. I give it a few minutes for the oil to get into the crankcase, and then start the engine and run it a couple of minutes. The oil pressure should come up almost immediately. Then I shut the engine off, wait a minute for the oil to drain back into the crankcase, and check the stick. Usually after a day of driving, that last little bit of oil in the quart bottle, will be needed to top it off.
This is my experience with Chevy 350 Vortecs; the TBI and carbureted engines are pretty similar except for the filter I used(PF35 or PF932 depending on clearance).
All our 350s must be the 4 quart pan then. I've never seen one with the drain plug on the bottom like that; all the ones we had, I changed oil multiple times and I remember it's on the left side edge.The shape of the pan itself and where the drain plug is. The 5qt pan uses a longer windage tray as well that goes forward one more main cap. 2 additional studs and nuts to hold it into place.
4qt pan
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5qt pan
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This is what the Milodon tray I use looks like. Takes a small amount of grinding to clearence the tray for the M99HVS pump. This is what it looks like when it is finished and the pan is ready to go on.
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All our 350s must be the 4 quart pan then. I've never seen one with the drain plug on the bottom like that; all the ones we had, I changed oil multiple times and I remember it's on the left side edge.
Do you happen to know if the deeper 5 quart pan will fit the 400 pickup/Burb chassis/frame clearance? If it would, that seems like an easy insurance policy for the engine.
Bingo. Get it up to temp and run it. Keep an eye out for coolant loss. A little milky condensate wouldn't worry me. A pan full of milkshake would.Another thought, aside from condensation or similar, is that maybe they (the old intake gaskets) were leaking prior to the change and some of that leak has been sitting deep down in the oil pan, not being able to "boil off"...