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If you think about it 15psi is nothing compared to the cylinder pressures of 150+psi.
When ever I do headgaskets or even GM 3.1/3.4 lower intake gaskets I always leave the oil in the pan till I'm...

That's for sure coolant mixed with oil getting pumped from the pan into the cylinder head. Either cracked block, possibly the block or maybe even the new head isn't flat and the HG is leaking. If...

That's weird.

What about the bearings did you check those out yet? Since your already going ahead with the repairs it would be worth the effort to pull a rod cap and have a look. I'm just going by the info you...

Is it a sludge engine? If yes then get an engine.
With the valves being bent you also have to think of what the valves did to the tops of the pistons. Imo I wouldn't use that engine. You might just...