Champion Engine Tune-up Chart 1964-1971 Passenger Cars & Light Trucks Cover

This is a photograph of the cover of a vintage Champion Spark Plugs "Engine Tune-up Chart" for Passenger Cars and Light Trucks, covering model years 1964 through 1971. The cover bears the classic Champion bowtie logo and an illustration of a spark plug along the right edge. A black-and-white photo insert shows technicians working at a "Sun 1120" electronic engine tester, one wearing a jacket with a "Dependable Champion Spark Plugs" patch. The right side of the cover contains an INDEX for U.S. Passenger Cars, listing which pages inside the chart cover each model year: 1971 (pages 1-4), 1970 (5-8), 1969 (9-12), 1968 (13-16), 1967 (17-20), 1966 (21-23), 1965 (24-27), and 1964 (28-30). From this cover a reader learns the document's scope (U.S. passenger cars and light trucks, 1964-1971 tune-up specifications) and where to find each year's data inside. No actual tune-up specifications, spark plug part numbers, gaps, or timing values are visible on this cover page; those would appear on interior pages. The chart appears to be a shop wall/reference booklet with hanging holes punched at the top.