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I've always found that the true messure of crankcass pressure was if the oil dipstick was "blown out of its tube." If it is not, I would replsce the filler cap gasket. The only other really wierd one I have run into was high crankcase pressure caused by a plugged exaust, This will not show up on a compression test from me experience but was the problem on my 88 740. Check to see if a smaller aftermarket muffler has been installed. The Volvo tend to use a large exaust, with at 2 - 2 1/2 inch OD
Good Luck
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