Re: L-78 Spark plug choice
I've always run the AC43N plugs in our L78 with zero problems. About 20K miles on the last set. NGKs lasted in our old snowmobiles when nothing else would. Everyone who uses them like them.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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