IMSA GTP 101: Porsche's 963 Internal Combustion Engine
There's simply nothing like the engine in Porsche's 963. In fact, it's the only one of its kind in IMSA's new WeatherTech SportsCar Championship hybrid GTP class.
Take a look at the time-honored roots and the modern take on the motor code named '9RD' that Porsche Penske Motorsport intends to take to victory lane at the 12 Hours of Sebring and the 24 Hours of Le Mans.
And if you missed any of the previous installments of our "GTP 101" series, CLICK HERE for the full playlist.
Marshall Pruett
The 2026 season marks Marshall Pruett's 40th year working in the sport. In his role today for RACER, Pruett covers open-wheel and sports car racing as a writer, reporter, photographer, and filmmaker. In his previous career, he served as a mechanic, engineer, and team manager in a variety of series, including IndyCar, IMSA, and World Challenge.
Read Marshall Pruett's articles
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