gt40 plug type
07-23-2011, 09:48 AM
#11
2nd Gear Member
Join Date: Feb 2010
Location: Texas
Posts: 303
Depending on what you want out of your plugs (long lasting or most efficient) Staying with your standard copper plugs is going to make your ignition more efficient than platinum and iridium. Drawback is copper plugs don't last as long. Never can go wrong with motorcraft. 
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