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While you are down this far there is one other thing you should do. Remove the oil gallery stopper bolt on the right side of the motor case and make sure the gallery is clean all the way through. Shavings from factory machining has been known to reside in here. Also, in the two outside and the center main bearings you will see small orifice plugs that can be removed with a screw driver (they are visible in one of your pictures). These even out the oil flow to all the mains as the ones that do not have the orifice plugs get more oil flow since they supply the oiling to the connecting rods through the feed holes in the crank. Make sure all these are open and clean.
Thanks for the great tip, I checked these passages and all is good. The orifices are clear too. I think the pressure washing through the main passage did the trick.
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