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I am still stumped. I am thinking that there may be gaskets for the pump, but I do not have any or recall seeing any. Is there in fact a gasket that seats between the pump and the cap, and is there an o-ring that seats on the shaft? If so, then this would be the culpret.

Also, to confirm, I have cup plugs installed under the cam retainer(X2). The internal plug by the oil pump drive, the 2 rear external plugs, the plug under the oil filter, and the cap plug under the rear main. If there are more than that then they are all in.

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did you use a set of main studs or aftermarket main bolts If so look very closely at the pump to stud or bolt clearance They can, and do, hold the pump from seating onto the main cap, don't ask me how I know that