YEa I have to go along with the other guys here on this one. If your pressure is dropping that much you have an oil pump issue or a bearing clearance problem.....or both.
If you haven't rebuilt one of these engines or for that matter any engine, they are easy. Cost really isn't bad. If you do the wrench bending and let a shop press out and in the sleeves, grind the valves, turn the crank, fit the wrist pins you can rebuild one for about 1200 or maybe a little less. I also think for a newby this is a great engine to learn on.
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