AC Spark Plug Specification Chart And Catalog

AC Spark Plug Specification Chart Catalog  Lates 1940s, is damn good for age.  Some paper loss, but can look through.   AC ("The Quality Spark Plug") catalog featuring spark plug specifications, heat range charts, and other automotive products.  Includes specific application listings for passenger cars from 1924–1940, trucks, buses, marine engines, and agricultural machinery.  Sections cover spark plug gaps, terminals, distributors, air cleaners, and rebuilt exchange fuel pumps.  Grumps Collectibles So-Cal.