Quote:
Originally Posted by thegreenhornet95
i have ngk's on my 1995 5.7 tbi but i want to go back to ac delcos but their heat rating is a 3 and the ngks is a 5 will this better or harm my mpg
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I would use the ac delco irridium plugs that are the OEM recommended plug. changing heat ranges is only done to attempt to overcome a worn engine problem.
these irridium plugs work much better than plats. they can take much higher heat .last much longer.. only problem is if you mess with the gap you will break the plug tips.