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Old 03-30-2010, 02:28 AM   #18 (permalink)
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Join Date: Jan 2010
Location: british columbia Canada
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Just as a point of interest i have experimented a wee bit with dimpling on the intake manifold port surfaces on a carbureted V8 engine ,and found a reduction in emissions of about 10%.This was years ago and wasn't worth writing home about.But there was an effect.
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