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Petronix Spark Plug Upgrade? By Linden - 03/26/2003 2:06:27 PM; IP 205.200.189.2 I have installed a Petronix system on my '59 352 4-barrel....question?; should I change the plugs.....if so...which ones and what gap? Thanks for your help guys.

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Skip Navigation Links. Petronix Spark Plug Upgrade? -- Linden, 03/26/2003  My customers report good results with stock plug, or equivalent. [n/m] -- Mr F, 04/01/2003

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