AC Delco VS. NGK Spark Plugs
12-27-2004, 01:30 PM
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AC Delco VS. NGK Spark Plugs Which is the better Spark Plug? "AC Delco or the NGK TR-55 Spark Plugs!" I know the AC Delco spark plugs are more expensive than the TR-55's. What are you fellow LS1 owners using and does one "Spark Plug" have an advantage over the other one! Thanks!!!
they are proven to be a great plug for the ls1 
