March 25th, 2025, 01:32 AM
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Senior Member
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Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
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Re: Spark Plugs for HEI Fired 351
The AC R44XLS6 is specifically an HEI plug which accepts .060 gap and is a long reach plug compatible with the GMC V6. Pete
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