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CHAMPION SPARK PLUGS 1973 CATALOG ADVERTISING BOOK CAR TRUCK & SNOMOBILE GUIDE | eBay
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Champion 516 D16 Industrial Spark Plug, Copper Plus
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Champion Spark Plug Guide 1933-1949 | eBay
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1969 Champion Spark Plug Recommendation Chart | Vintage Ignition
Before you post your spark plugs, take a look at this useful spark plug analysis chart! : r/MechanicAdvice
