PORSCHE RACING HISTORY1971 - Can-Am Watkins Glen
25 July 1971 - Watkins Glen, USA
Jo Siffert 3rd overall in a Porsche 917/10
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 20 | Porsche 917/10 | 917/10-002 | Jo Siffert (CH) | Vasek Polak Racing | 3rd | 9th | 80 laps | ||
| 92 | Porsche 917 K | 917-015 | Gijs van Lennep (NL) | John Wyer Automotive (GB) | 9th | 8th | 78 laps | ||
| 93 | Porsche 917 K | 917-016 | Derek Bell (GB) | John Wyer Automotive (GB) | 11th | 15th | 77 laps | ||
| 91 | Porsche 917 K | 917-014 | Richard Attwood (GB) | John Wyer Automotive (GB) | 13th | 11th | 77 laps | ||
| 43 | Porsche 917 K | 917-010 | Mario Cabral (P) | David Piper Racing | 17th | 24th | 71 laps | ||
| 87 | Porsche 908/02 | 908/02-015 | Steve Matchett (USA) | A. G. Dean | DNF | 26th | 32 laps - Valve Gear |
Can-Am - Canadian-American Challenge Cup
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