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Are you running ported vacuum or manifold vacuum. Do you have a vacuum gauge while you are running to see how many inches you are pulling when it starts to ping and is the vacuum steady throughout the rpm range.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper
72 bug(the better half's) under reconstruction
2009 HHR aqua blue
71 GMC k20 350/sm465
2009 Chevy hd3500 6.6 Victory Red crew cab dually
Dave & Jeanne
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