Russ,
Yes, you should have oil coming to the rocker arms and from the passage that you unplugged. The shop manual page Hoyt provided shows the oiling circuit for your engine. I think the head bolt you mentioned should have a relief just below the bolt head, to allow oil to flow around the bolt and to the rocker arms, but memory is foggy on that point. Since you don't have oil coming through the passage from below, it sounds like you have a blockage in the oil galley, in either the head or the block- that was not uncommon in those models as they got miles on them. You might try filling the oil passage with penetrating oil or some engine cleaner solvent to see if you can loosen the blockage. Some say diesel fuel works for that purpose, but I haven't tried it, other than for penetrating oil. It seems to work for that. You could also try probing the oil passage with heavy, stranded wire (12 or 14 AWG) as much as you can, to see if you can open up the galley. The stranded wire of that size is stiff enough to break soft blockages, but still flexible enough to bend if it needs to.
The lack of oil to the rocker arms could also be the result of internal leakage and low oil pressure. If you have reasonably good oil pressure at idle, that is not so likely, so don't get involved with that just yet.
Harvester
