PORSCHE RACING HISTORYPorsche 917/10 - Chassis No. 917-028
917 PA (Porsche Audi) Developed for a Can-Am campaign
17 August 1969 - Can-Am Mid-Ohio - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | 4th | 7th | 79 laps |
31 August 1969 - Can-Am Road America - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | DNF | 8th | 6 laps - Engine |
14 September 1969 - Can-Am Bridgehampton - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | 3rd | 7th | 70 laps |
28 September 1969 - Can-Am Michigan - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | 4th | 3rd | 64 laps |
12 October 1969 - Can-Am Laguna Seca - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | 5th | 6th | 79 laps |
26 October 1969 - Can-Am Riverside - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | DNF | 11th | 17 laps - Oil Leak |
9 November 1969 - Can-Am Texas - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Jo Siffert (CH) | Porsche Audi | 4th | 9th | 69 laps |
27 June 1971 - Can-Am St. Jovite - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 8th | 8th | 70 laps |
11 July 1971 - Can-Am Road Atlanta - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 5th | 11th | 70 laps |
22 August 1971 - Can-Am Mid-Ohio - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 6th | 12th | 75 laps |
12 September 1971 - Can-Am Donnybrooke - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 7th | 10th | 67 laps |
26 September 1971 - Can-Am Edmonton - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 5th | 11th | 77 laps |
17 October 1971 - Can-Am Laguna Seca - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 9th | 14th | 86 laps |
31 October 1971 - Can-Am Riverside - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 6th | 12th | 59 laps |
15 October 1972 - Can-Am Laguna Seca - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 20 | Porsche 917 PA | 917-028 | Sam Posey (USA) | Vasek Polak Racing | 5th | 13th | 85 laps |
29 October 1972 - Can-Am Riverside - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 20 | Porsche 917 PA/TC | 917-028 | Sam Posey (USA) | Vasek Polak Racing | DNF | 23rd | 31 laps - Gearbox |
10 June 1973 - Can-Am Mosport - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 917/10 | 917-028 | Steve Durst (USA) | Vasek Polak Racing | 5th | 14th | 77 laps |
8 July 1973 - Can-Am Road Atlanta - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 917/10 | 917-028 | Steve Durst (USA) | Vasek Polak Racing | 7th | 15th | 83 laps |
22 July 1973 - Can-Am Watkins Glen - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 917/10 | 917-028 | Steve Durst (USA) | Vasek Polak Racing | 7th | 17th | 55 laps |
12 August 1973 - Can-Am Mid-Ohio - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 917/10 | 917-028 | Steve Durst (USA) | Vasek Polak Racing | 10th | 19th | 77 laps |
14 October 1973 - Can-Am Laguna Seca - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 917/10 TC | 917-028 | Brian Redman (GB) | Vasek Polak Racing | DNF | 4th | 30 laps - Blown Engine |
29 October 1973 - Can-Am Riverside - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 917/10 TC | 917-028 | Brian Redman (GB) | Vasek Polak Racing | DNF | 4th | 31 laps - Suspension |