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Old 09-19-2002, 06:02 PM
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Using an open spacer on a dual plane manifold, will defeat the design of the dual plane manifold. Obviously, a dual plane manifold splits the carburetor in half and allows increased velocity at the carburetor's venturi booster, especially at lower engine speeds, the result of this is better low speed driveability, and improved low and midrange torque, the trade-off is less top end horsepower, as each cylinder cannot draw of the entire carburetor at high engine speeds, adding an open spacer to a dual plane manifold is kind of like putting a band aid fix on the whole deal. Just as Four Jaw said, today's purpose designed manifolds are so good, this type of thing is not necessary, unless of course you are restricted to some kind of factory type manifold, where I have seen the plenum divider removed, but most ot the time this is on a circle burner, that never drops below 3500 RPM. However, spacers are a great tuning tool, allowing you to adjust plenum volumes, or to straighten airflow when necessary.
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