I have discovered that I have been running the wrong spark plugs in my engine. I have a 327 with aluminum heads stock cam. The plugs are NGK 5238. The gap recommendation is 35-45. Where is the best spark 35 or 45? I need a schooling on plugs. I drive the truck some, but not enough. I am using 93-octane fuel. I think I have asked about the plug gap before, but I do not want to know the gap I want to know about the performance for stock fuel mileage. I am using a HEI distrubitor.
rayharris
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