One of the last Kansas City-built 1970 Chevelle LS6 coupes, equipped with its original drivetrain, is up for auction today.

But none were as potent as the Chevelle SS 454 LS6. The ultimate iteration of Chevrolet's midsize car, the SS 454 LS6, was sold in 1970 only with a 454-cubic-inch (7.4-liter) V8 rated at 450 ...

Although badly shaken, the Corvette wasn’t out of the game—its 454-cube LS6 was rated at 425 horsepower. It was a downgrade from the 450-hp output of the 1970 version of the engine.