![]() ![]() The iRacing Riley Mk XX runs a Pontiac V8 and a five-speed Xtrac transmission, but IMSA rules permit a wide variety of engine brands and configurations, all of them limited in power output to about the same as the Pontiac’s – approximately 500 horsepower – which is plenty for a 2,275-pound, flat-bottomed car with limited downforce. Riley Technologies ranks among America’s most successful sports car chassis constructors and its Riley Mk XX is among the most successful of all Daytona Prototype racers. ![]()
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