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1973 Mark Brelsford Champion Spark Plugs Ad

Number Six. Nearly every cycle buff knows that Mark Brelsford won the AMA Grand National Championship in 1972. And the right to carry AMA's number one plate for 1973. But did you know that this is the sixth straight year that the Grand National Champion has been fired to victory by Champion spark plugs? Mark's Champion-sparked predecessors include Gary Nixon, who took the title in '67 and '68, Mert Lawwill, the '69 winner, Gene Romero in '70, and Dick Mann in '71...