Oldsmobile's initial A-Body entry was known as the F-85. While that name alone may not be recognizable, checking the right boxes on your F-85 order sheet would've given you several better-known variations such as the Cutlass, Vista Cruiser, or 4-4-2.

Creates a considerably hotter spark that lets the flame expand more rapidly in the combustion chamber and a more complete and efficient burn of the air/fuel mixture