Could a person spin the oil pump with plugs out using the starter?
Short answer... yes. That would turn the oil pump and would produce some oil pressure!
If you want to pull the spark plugs and spin it over, it certainly wouldn't hurt!
Be sure to disable the ignition system! If not, you may cause damage.
Keep in mind that your crankshaft and camshaft bearings will have an oil film within the area. This oil film does not disapate easily.... even given years of sitting unused. Ask most anyone who has disassembled an old engine if they saw any dry bearing surfaces!
During your start up attempts, the oil pump should prime all necessary areas. The cam followers and internal plungers will be last, and may require more turns.
The cylinder walls below the piston rings rely on splash lubrication, so these areas will not recieve any oil until the rotating assembly begins to spin.
I see no foul no harm in simply trying to start the engine, and maintain 1,200 rpm or so for a while.
You should know immediately if things are OK... or not OK!
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