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the brand and style of plug does not make a dramatic difference in performance unless there is something else in play to effect the spark efficiancy. if you did a major upfit on your ignition, like to a 16volt system, or had boost/spray going through it, then you would have conditions that coudl show a difference between styles and brands.
if you jsut want to do a tune up, get the regular ac delco/autolite plugs from the parts store.
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