Without this car, Porsche’s total domination of Canadian-American Challenge Cup racing might
never have happened. In 1969 Can-Am racing was popular in the United States; America was Porsche’s best
export market; a Porsche Can-Am car followed naturally. Group 7 – a class constrained by almost no rules,
neither a maximum engine capacity nor a minimum car weight being specified – was a playground at the
time for the two mega-horsepower ultra-light Chevy-powered Team McLarens. Porsche’s first entry in this
new venture would race as an underdog, a role the firm knew well.
The decision to enter the Can-Am series was made mid-season 1969. Porsche would provide the
car, driver Jo Siffert and a full support crew; the new Porsche & Audi Division of Volkswagen of America
would sponsor the entry. The contract signed, the only problem remaining was making a Group 7 racer out
of the Group 5 917, and doing it fast. Work began after LeMans in June; the 917 PA (for Porsche/Audi)
arrived in the States in August.
A makeshift solution, the PA was a 917 shorn of its coupe top and fitted with a body inspired by the
908/2 Flounder prototype. The 100 or so pounds saved were offset by the 56 gallons of fuel required to run
these sprint races nonstop. The engine was strictly stock, all 4.5 liters of it. At the starting line of its first
race at Mid-Ohio, the 917 PA gave away three liters, 200 pounds and 250 horsepower to the McLarens.
Five races had already been missed. In the six that remained, thanks to its endurance racing
reliability, the 917 PA finished in all but one, took second once – and placed fourth overall in the Can-Am
Championship. Naturally Porsche was encouraged.
The rest is well-recorded history. A full Can-Am assault with the 917/10 and 10 Turbo took the
Can-Ams laurels away from the McLarens. In 1973 the 917/30 followed with such devastating dominance
that the Can-Am series died for lack of competition.
Nineteen sixty-nine did not end the display car’s Can-Am competition. Acquired by Vasek Polak
and gradually converted into a full 917/10 fitted with an 1100 hp turbo motor from the 917/30, the 917 PA
raced in more Can-Ams than any other Group 7 car and remained competitive until its retirement.
Photos – Peter Harholdt
The GT 40 earned its name due to the fact that it is 40" high. Learn more