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. Then shut the car off and hook up the outboards. have somebody get in the car and floor it. Make sure all 3 are wide open.

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I've never seen any vacume actuated six pak open when in nuetral at WOT, with the motor running or not OP, sixpaks will barely start to open the outboards when hitting the throttle to wide open, by the time the motor builds up enough manifold CFM flow to actuate the vacume secondary pods the motor will be revved way higher than you want to hear