marshall13
Senior Member
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the first step is to admit your ignorance
Posts: 301
Fort Lauderdale FL
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8.5:1 compression ratio, emission spark box=87 octane(pump reg)... if you get pinging or knock with that, you need a colder plug, not higher octane.... or maybe the ol' combustion chamber needs a good decarb..... running primo in a smog motor just coats your plugs with octane booster residue(pale freckles), that increases resistance of the airgap, giving a colder spark.....
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