Drained old oil from sitting for 25 years...
Cleaned pistons, got new rings, honed cylinders....
Before I pot all this back together should I be worried about sludgy oil?
How do I check?
Should I just flush it?
Does it have to be running to flush effectively?
Should I crack the case to clean it up ...or is there an oil pan or something?
-> opening it up scares the crap out of me.

Thanks