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Author Topic: True HRD PORTING vs Play Duner Porting  (Read 1725 times)

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Re: True HRD PORTING vs Play Duner Porting
« on: January 28, 2013, 07:52:45 pm »
HRD  stands for "Hot Rod Duner" I was under the impression it was a larger bore 88mm (535cc and up), with aggressive midrange and strong top end porting for duning and some hill shooting.
I think every decent engine builder has some type of recipe for there type HRD porting.
 
I'm right with Mitch on this one.

 

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