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Old 01-11-2013, 04:47 PM
jumbo2 jumbo2 is offline
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820s are open chamber heads oval port almost identical to 781s but Stan Weiss seems to think they flow better on the exhaust side , 113cc and some measured up to 118 over the years and depending on year

Last edited by jumbo2; 01-11-2013 at 04:52 PM.
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