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 Posted: 05-28-2017 01:58 am
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redracer

 

Joined: 09-10-2012
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If you pull the top off you will notice the 2 holes in the bottom of the piston; if they are closest to the butterfly, the response time for acceleration will be faster. You can "live" with the orientation in any of the 4 positions, but the response time (greatest "vacuum" or pressure differential) will be quickest in the 2 holes to the rear of the opening.