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10-12-2007, 07:42 AM   #4 (permalink)
ou812
 
Join Date: Nov 2004
Location: SoCal
Posts: 353
Re: 418W build up - RPM or Vic Jr.

The ports will be plenty fast with 400+cid pulling on them! I would be more worried about the ports stalling and causing seperation, even at 6000 rpm.
3" exhaust could be worth 50HP on that engine!!
Brian
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www.immengines.com
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