Spark plug: R42CTS vs R42TS - What's the "C" for?
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Spark plug: R42CTS vs R42TS - What's the "C" for?
So, what's the C for? My owners manual from '86 says "R42CTS". Now, seems like that plug # is outdated, and the plugs are labeled "R42TS". Was the "C" for copper? If it was, why isn't it part of the plug number anymore?
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From: Albuquerque NM
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