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I've never heard of any engine having a vacuum under normal circumstances. They will produce some pressure from combustion gases getting by the rings into the crankcase. How much depends on the condition of the rings. Zero to slight pressure should cause no concern. Some race engines will have...

Glad you got er goin mepgen!

What is your oil pressure reading? The tip off on this machine was high oil pressure.

Doesn't look like actual metal to metal contact. I wouldn't think the valves would contact the pistons even if the lifters pumped up all the way. In fact I would expect the lifters to pump up all the way normally but with proper oil and pressure they would have some give. I have been looking...

That is interesting. In the automotive world a pegged oil pressure gauge could indicate a stuck oil pressure relief valve. Haven't looked to see if the 803 has one but most positive displacement pumps require some method of regulation.