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Old 02-11-2007 | 03:44 PM
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qcrc
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From: IA Quad Cities
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I can't find a link for you but it is in Xtreme RC Cars issue #136 (March, 07).
Look in the Nitro Tuner department. Basically, grooves are made in the head button from the plug to the outside edge to speed up and fully combust the fuel. They tried it and dyno'd it and it seemed to improve horsepower and torque.
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