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 Posted: Wednesday Jul 24th, 2013 02:18 AM
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Kelly Hart
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Joined: Tuesday Sep 13th, 2005
Location: East Wenatchee, Washington USA
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Revised Rule for 600R for the remaining 2013 Season
Engine Terms and Conditions
Restrictor Plates: ¾” restrictor plates must be positioned flat in each intake tract such that ALL air entering the engine MUST flow through the ¾” hole in the restrictor plate. No add-on inserts or devices designed to improve air flow thru the restrictor plate. Plates may be positioned anywhere in the “Stack” (head, manifold, throttle body), as long as air flow meets the above criteria



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