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Old 12-12-2006, 11:29 PM
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Totally depends on your intended use. Spacers can help or do nothing sometimes.

In general, a four-hole spacer (one for each barrel) is supposed to act like increasing the runner length which favors torque production down low. Open spacers increase the plenum volume which often helps higher RPM power.

In actual use, sometimes they provide 15 hp, other times they do zip.
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