If material has been removed from the wrong areas of the intake and-or exhaust track, you can cause a turbulence that will stall the air flow causing no gains beyond a given lift. Depending on what has been done to the head, it's hard if not impossible to correct the mistake. It may be more cost effective to start over with other heads. A good head porter will be able to make that call.
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2005 RG 98cu in
Last edited by mocotom; 03-01-2013 at 06:29 PM.