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Porsche was putting most of their factory racing efforts during the sixties and early seventies into the 906, 910, 907 908 and 917 and aside from the 911R left much of the development of the 911 and 911S to their racing customers. In 1967 they built 22 of... morePorsche was putting most of their factory racing efforts during the sixties and early seventies into the 906, 910, 907 908 and 917 and aside from the 911R left much of the development of the 911 and 911S to their racing customers. In 1967 they built 22 of the very radical 911Rs. The "R" was derived from the German word rennen, which means race.
