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5 Just to see if bigger is better, we tried a second spacer, this time a 1.5-inch-thick, four-hole design from Wilson Manifolds. This spacer did improve our peak horsepower numbers, upping them to 420 hp. We did see a 1 lb-ft drop in torque, but we think 1 lb-ft is worth 4 hp. The new cam choice and 1.5-inch spacer now made our gains 85 hp and 37 lb-ft over the stock crate motor.