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The Rochester F.I. idle circuit requires air plumbed from the air meter to four nozzle blocks (that hold the nozzles in place) at each corner of the plenum. Because the air meter was moved some distance from the lines used for this purpose, a small K&N air filter, PN 62-1360, was used to filter the air at idle speeds. The 3/4-inch opening at the bottom of the air meter was capped with a rubber cover.