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Author Topic:   Vortec Heads-What Spark Plug
posted June 03, 2004 10:48 PM
On a gas engine with Vortecs we run Autolite AR472. Champion plugs would be S57C or S59C. Start with the 57's and read your plugs from there. If your not running an MSD, then gap your plug's at .040" . If you have a MSD, you can open the gap up to

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