The Porsche 356 started out with a really small VW Beetle-derived engine in the early 1950s, which was kept and improved over the years, and the car finally began gaining some performance from it in its later years.
However, for racing, Porsche decided that they didn’t want to use the same engine, and so they made one of their own, a twin-cam two-liter unit which put out around 130 hp - it had four cams in total, and is usually referred to as the "four-cam."
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