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Al, according to what i have read. It goes in the hole closest to the block,or right behind the oil filter thread rod if you are running an oil cooler. So makes me believe the other hole if not running a oil cooler. I would contact your GM dealer or a GM TECH for a concrete answer. Roger
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Roger thats right..finally got a concrete answer from someone in the know..tech line gave me the wrong answer!!
..getting a second pressure reg tomorrow and will try again.
ALber