Langhorne 150
Langhorne Speedway
1 Mile Paved Oval
150 Laps/150 Miles
August 7, 1966
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
Points |
| 1 | 2 | Roger McCluskey | 8 | G. C. Murphy | Eagle | Ford | 150 | 1:22:57.25 108.493 | 300 |
| 2 | 3 | Gordon Johncock | 72 | Weinberger Homes | Gerhardt | Ford | 150 | Finished | 240 |
| 3 | 6 | Al Unser | 24 | American Red Ball | Lola | Ford | 150 | Finished | 210 |
| 4 | 4 | Gary Congdon | 53 | Valvoline | Huffaker | Offy | 150 | Finished | 180 |
| 5 | 1 | Don Branson | 4 | Leader Card | Watson D | Offy | 149 | Flagged | 150 |
| 6 | 19 | Bud Tingelstad | 22 | Federal Engineering | Gerhardt | Offy SC | 148 | Flagged | 120 |
| 7 | 8 | Chuck Hulse | 12 | Wynn's | Watson D | Offy | 148 | Flagged | 90 |
| 8 | 9 | Bob Harkey | 81 | Central Excavating | Gerhardt | Offy | 146 | Flagged | 75 |
| 9 | 21 | Dick Atkins | 98 | Agajanian REV 500 | Shrike | Offy SC | 146 | Flagged | 60 |
| 10 | 24 | Ralph Liguori | 35 | Enterprise Machine | Flynn D | Offy | 143 | Flagged | 45 |
| 11 | 13 | George Snider | 82 | Sheraton-Thompson | Lotus | Ford | 143 | Flagged | 30 |
| 12 | 16 | Arnie Knepper | 95 | Leader Card | Watson FE | Offy | 143 | Flagged | 15 |
| 13 | 10 | Wally Dallenbach | 24 | Ken Brenn | Meskowski D | Offy | 140 | Flagged | |
| 14 | 23 | Al Miller (Krulac) | 85 | Caves Buick | Gerhardt | Offy SC | 137 | Flagged | |
| 15 | 18 | Carl Williams | 25 | Dayton Steel Wheel | Watson FE | Offy | 137 | Flagged | |
| 16 | 17 | Ronnie Duman | 96 | Harrison | Eisert | Chevy | 136 | Flagged | |
| 17 | 22 | Al Smith | 70 | Bob Lesko | Turner D | Offy | 135 | Flagged | |
| 18 | 14 | Bruce Jacobi | 80 | California Speed Shop | Halibrand | Offy | 131 | Oil leak | |
| 19 | 12 | Bobby Unser | 86 | Leader Card | Watson | Offy | 114 | Spun out | |
| 20 | 5 | Billy Foster | 27 | Jim Robbins | Vollstedt | Ford | 34 | Spun out | |
| 21 | 20 | Mario Andretti | 66 | Jim Robbins | Vollstedt | Ford | 33 | Oil leak | |
| 22 | 7 | Jim McElreath | 3 | Zink-Urschel-Slick | Brabham | Ford | 24 | Wheel bearing | |
| 23 | 15 | Art Pollard | 76 | Pure Firebird | Gerhardt | Offy SC | 20 | Broken suspension | |
| 24 | 11 | Lloyd Ruby | 29 | All American Racers | Lotus | Ford | 9 | Broken radius rod | |
| -- | -- | Jim McElreath | 25 | Dayton Steel Wheel | Watson FE | Offy | X | Relieved C. Williams | |
| -- | -- | Mario Andretti | 1 | Dean Van Lines | Brawner Hawk | Ford | -- | Wrecked qualifying | |
| -- | -- | Chuck Arnold | 58 | Nelson | Kurtis FE | Offy | -- | DNS, too slow | |
| -- | -- | Gary Bettenhausen | 61 | American Eagle | Meskowski D | Offy | -- | DNS, too slow | |
| -- | -- | Larry Dickson | 11 | Vita Fresh Orange Juice | Huffaker | Ford | -- | DNS, too slow | |
| -- | -- | Ray Duckworth | 97 | Stoye Racing | Stoye D | Offy | -- | DNS, too slow | |
| -- | -- | A. J. Foyt | 2 | Sheraton-Thompson | Meskowski D | Offy | -- | Withdrew | |
| -- | -- | John Hollansworth | 42 | Hollansworth | Epperly FE | Offy | -- | DNS, too slow | |
| -- | -- | Bob King | 36 | Stahl Brothers | Kuzma D | Chevy | -- | Did not qualify | |
| -- | -- | Joe Leonard | 6 | Yamaha | Eagle | Ford | -- | Withdrew after qualifying | |
| -- | -- | Gig Stephens | 44 | Stahl | Kuzma D | Offy | -- | Did not qualify | |
| -- | -- | Sam Sessions | 34 | Michner Petroleum | Lola | Ford | -- | Wrecked practice | |
| -- | -- | Cale Yarborough | 66 | Jim Robbins | Vollstedt | Ford | -- | Raced by Ma. Andretti | |
| -- | -- | Gig Stephens | 71 | Fairchild-Hiller | Halibrand | Offy | -- | Did not appear |
| Lap Leaders | Total | Laps |
| Roger McCluskey | 142 | 1-78, 87-150 |
| Gordon Johncock | 8 | 79-86 |