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My engines are a stock 84 Euro S, and a stock US 83 S. The Euro has a fresh set of WR7DC plugs, not sure what or how old in the US 83.
Colder plug on the Euro S I am thinking might allow a bit more advance running the 91 octane gas thats as good as it gets in Calif.
BTW whats with silver, sounds goofy for a spark plug?
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