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Oil pump gears, left over from a previous failure that didn't get caught (if the current oil pump looks ok). There's nothing else that it could be since the J-tube goes right from the pressure side of the oil pump up to the T-stat, then to the pressure relief valve. Anything else would have had to pass through the pressure side pump gears. That's my guess.
Make sure that you replace the engine mounted oil cooler, too. There's probably left over trash in it.
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