For those who weren't around to drive these tires in their original form, the Goodyear Polyglas offered a big improvement over the Firestone. The bias plies helped prevent wheel hop and gave a more forgiving ride due to diagonal plies. Chrysler used them as standard equipment by 1970, likely earlier. Ford used them interchangeably on Mustangs 1968-up. GM used them on some Camaros, particularly Z-28. Pontiac likely substituted them for the Firestone when they became available in sufficient quantity. If true, there should be a bulletin somewhere.


Coming from the master of distraction himself!