The late 1960s was a cool time for American cars. This was the time when people made cars that were super fast and strong. Car companies were always trying to make their cars better than the others.

Topped off by a standard open-element, chrome-lid air cleaner, the L89's unpainted alloy cylinder heads are easy to spot. Internal L78 and L89 features included a four-bolt main bearing, high-chromium ...

Even in the golden age of hot-rodding, the mid-'60s and early '70s, sometimes what GM was churning out, although cool, wasn't enough for the die-hard gearhead. They wanted more, and that pent-up ...