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26 Like the carb comparison, the results from each spacer test yield differences of less than 10 hp and/or lb-ft either way. Spacers are, obviously, more of a tuning aid than a way to jack horsepower numbers. Even so, the test was fun and in one way surprising. We thought the 2-inch open spacer would give us the best results, but in fact it was the 1-inch open that won this contest.