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I'm thinking it could bad a bad valve seat, I doubt it would be bad rings/walls on just one cylinder... What do you guys think? I also think that it is not a good idea to put anything in your oil, I am told that this is instant knock for older cars. I am not sure and I wouldn't recommend it without a second opnion, But is is it possible to run a hotter plg in cyl #1? What you guys say?
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Robert
1955 Oldsmobile Super 88 
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