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Every time a muscle car driver stabs the brake pedal at speed, a 350-year-old physics principle is doing the actual work of stopping two tons of steel. This closer look at the hydraulic brake system explains how a French mathematician’s law ended up governing one of the most important systems in your car, and why it’s still unbeaten by anything simpler.
Chevrolet built about 120,000 Impala Super Sports for 1966, but only a sliver of those left the factory pairing the 425-horsepower L72 427 big block with a four-speed manual instead of the far more common automatic. It is a combination so rare that even dedicated Bow Tie historians cannot agree on an exact production count, hidden inside a car that looked like nothing more than a comfortable family cruiser. Read on to find out what made this pairing so scarce, and why so few original buyers dared to check that box.