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In stock trim, Olds motors have weak oil return systems that flood the cylinder heads at high rpm. The result is too much oil in the top, and not enough in the pan. To help keep the oil in the pan, Mondello set us up with its oil restrictors, which were tapped into the oil galleys in the main bearing saddles. Likewise, the oil holes in the main bearings were enlarged, and cam bearings with smaller oil holes were installed as well. View Related Article
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