Previous Few Cars. Willi Kauhsen of Germany driving a Porsche 917/10T. 1972	Willi Kauhsen of Germany driving a Porsche 917/10T. 1972	Sam Posey in his Porsche 917 Spyder/5.4. 1972	Milt Minter driving a Prosche 917-10. This car was powered by a 5 liter turbo-charged engine. The same engine the Penske team used. Vasek Polak convinced Porche to provide him the same engines. Milt Minter would finish the 1972 second overall behind George Follmer.Read more about the car and Sam's #20. 1972	Peter Gregg of Jacksonville, FL. driving a Prosche 4500 turbo. Car is owned by Brumos Prosche-Audi. (1972) Front Page