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I wonder if the sequence you tighten the bolts have anything to do with the whistling. Old school says you should tighten using a cross pattern, but this method is for FLAT mating surfaces. The wedge is on a slant.......maybe it would be better to tighten either the top or bottom first before doing the other. I'll have to try this and see if the whistling disappears. Just cranking down on the bolts could cause warpage.....if I remember right, the throttle body bolts weren't really that tight when I first removed them.
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