See pics for condition.

1962 Champion Spark Plugs Service Tips Booklet AB8

I
NTRODUCTION
Modern automotive engines have created new standards of power, efficiency and overall perform-ance. These improvements have been made possible by such things as:
stepped up compression ratios higher octane fuels better "breathing" increased R.P.M.'s
Because of this trend, demands on the ignition system have greatly increased. Spark plugs in particular have been forced to operate under greater extremes of voltage, temperature and pressure ... to say nothing about more corrosive surroundings! These pages, therefore, have been designed to help you obtain maximum spark plug performance ...and to improve overall ignition system efficiency.