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I took the thing off and grinded it out and smoothed it with a drum roll too. i also had to shave off the fitting on the right side it interfered with the throttle plate of the new TB. Extrude hone ported the thing also, I saw no real improvement, maybe 1 hp on a dyno if I ran it. The smooth airflow may hurt the swirl, but the new cams will like it.
chris 92 classic
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