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Old 01-05-2005, 09:20 PM
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Port matching the intake side of the manifold will definitely help upper rpm hp. If the intake is bigger than the head intake port, it will cause puddling though. If the intake is smaller than the head intake port, it will increase velocity of the a/f mixture. As far as the plenum, I'd leave it alone. If you get it too smooth, it will hurt atomization of the a/f mixture.
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