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Best Spark Plugs

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08-10-2012, 01:48 AM	#1
mattpiotr Registered User Join Date: Oct 2011 Location: Michigan City, Indiana Posts: 158	Best Spark Plugs I have a 1986 GMC 2500 with the 350(Vin Number M) it has a comp cam .454 lift with 268 duration i have auto lite plugs in there not and dont really seam to have the performance im looking for. what would be the best spark plug for me?

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