Hart 420S: The Lightweight, Four-Cylinder 1970s Creation That Produced 305 HP

Half a century ago, an engine could already weigh about 200 pounds and make over 300 horsepower.

  Car Talk, Autos   Oct 14, 2026   0   15  Add to Reading List
Hart 420S: The Lightweight, Four-Cylinder 1970s Creation That Produced 305 HP












Measuring just 2.0 liters and producing up to 305 horsepower, the Hart 420S stormed onto the Formula 2 open-wheel racing scene as one of the lightest 300-horsepower competition engines of its day. The mill reportedly weighed as little as 220 pounds, and its main objective was to remove as much weight as possible, giving whichever car that used it a definitive handling advantage. The Hart 420S was also destined for sports-car racing, giving it a broad scope of potential applications.

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