7 1/4 suregrip

The reason people ordered them from the factory on low performance cars like a /6 was not for traction at the drags but traction in the snow and ice. It amazing how people got by in the 70s before the mainstream use of 4WD and FWD in the northern climates. A 68 /6 Valiant with a limited slip and a set of chains in the trunk and you were up a logging road looking to put a deer on the trunk.