PORSCHE RACING HISTORY1971 - Watkins Glen 6 Hours
24 July 1971 - Watkins Glen, USA
Jo Siffert & Gijs van Lennep win Class S and 2nd overall, 2 laps behind the winning Alfa Romeo T33 driven by Andre de Adamich & Ronnie Peterson. Porsche 914/6 wins Class GT+2.5
Overall - 2nd, 3rd : S - 1st, 2nd : GT+2.5 - 1st : GT2.5 - 2nd
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 917 K | 917-014 | S | Jo Siffert (CH)/Gijs van Lennep (NL) | J. W. Automotive Engineering (GB) | 2nd | 1st | 2nd | 277 laps |
| 2 | Porsche 917 K | 917-015 | S | Derek Bell (GB)/Richard Attwood (GB) | J. W. Automotive Engineering (GB) | 3rd | 2nd | 4th | 259 laps |
| 59 | Porsche 914/6 | 914 043 2563 | GT+2.5 | Peter Gregg (USA)/Hurley Haywood (USA) | Brumos Porsche-Audi (USA) | 6th | 1st | 19th | 229 laps |
| 31 | Porsche 911 T | 118 10 429 | GT2.5 | Bert Everett (USA)/Bob Beasley (USA) | Locke Development Corporation (USA) | 9th | 2nd | 26th | 168 laps |
| 68 | Porsche 911 S | GT2.5 | Pat Keating (USA)/Levon Pentecost (USA)/Anthony Torgersen (USA) | Baker Motor Co. | 10th | 22nd | 162 laps | ||
| 43 | Porsche 917 K | 917-010 | S | Tony Adamowicz (USA)/Mario Cabral (P) | David Piper Racing (GB) | NC | 11th | 191 laps | |
| 46 | Porsche 906 K | 906-113 | S | Mike Rahal (USA)/Hugh Wise (USA)/Horst Kroll (CDN) | Brokers Racing/Nationwide Food | NC | 18th | 180 laps | |
| 87 | Porsche 908/02 | 908/02-015 | P | Tony Dean (GB)/Steve Matchett (USA)/Chuck Parsons (USA) | A. G. Dean (Racing) (GB) | DNF | 15th | 47 laps - Fuel Pump | |
| 32 | Porsche 911 S | GT2.5 | Jim Locke (USA)/Bob Bailey (USA) | Locke Development Corporation (USA) | DNF | 21st | 25 laps - Wheel | ||
| 16 | Porsche 911 T | GT2.5 | Michael Keyser (USA)/Bruce Jennings (USA) | Toad Hall Racing | DNF | 28th | 13 laps - Collision |
International Championship for Makes Watkins Glen 6 Hours
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