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15b We've tested this particular spacer on many different engine combinations in the past 10 years with dyno results of 7 to 13 rwhp and average e.t. benefits of a tenth and 1 mph. Longer studs (Summit PN ARP-200-2408) are needed to accommodate the 1-inch spacer. We used an open-hole carburetor gasket (MRG-54C) under and a four-hole gasket (MRG-55C) on the top of the spacer (as seen).