maddzz1 Posted June 25, 2010 Posted June 25, 2010 A friend asked me to get some recommendations for spark plugs for his Denali. It is the bigger Vortec V8
kro10000 Posted June 26, 2010 Posted June 26, 2010 OE AC Delco plugs, don't fall for the new trend of "improved" design plugs (aka bosch plus 2/4, E3 etc) I would only run the factory type delcos
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