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has he checked oil pressure with a mechanical gauge?
can u confirm?
can he check it with a mechanical gauge? that will tell us if its a internal engine failure like rod or main bearings or a external issue like a failed gauge or a harness issue
then its internal either a oil pump failure or rod or main bearing failure...
did he check the rod and main bearings for scoring or wear?
did he prime the oil pump..? and no on the vapor lock
did he prime the oil pump?
and this is a 1990?
did he check the gears with feeler gauges?
have him check the oil pump here is the proper procedure.......
a little oil in the pump and fill the filter and crank