| Official Race Results | |||||||||
| Mason-Dixon 500 | Dover Downs International Speedway | |||||||||
| May 21, 1978 | Race 11 of 30 | |||||||||
| Average Speed: 114.664 mph | |||||||||
| Margin of Victory: 12 seconds | Time of Race: 04:21:38 | ||||||||
| Lead Changes: 16 | |||||||||
| Cautions: 6 for 37 laps. | |||||||||
| Fin | St | Car | Driver | Make | Sponsor | Pts / Bonus | Laps | Status | Winnings |
| 1 | 3 | #21 | David Pearson | Mercury | Purolator | 180/5 | 500 | Running | $11,700 |
| 2 | 5 | #11 | Cale Yarborough | Oldsmobile | 1st Nat'l City Trav. Cks. | 175/5 | 500 | Running | $12,700 |
| 3 | 4 | #54 | Lennie Pond | Chevrolet | W.i.n. | 170/5 | 499 | Running | $6,750 |
| 4 | 2 | #72 | Benny Parsons | Chevrolet | 1st Nat'l City Trav. Cks. | 165/5 | 498 | Running | $7,400 |
| 5 | 10 | #5 | Neil Bonnett | Dodge | Armor All | 160/5 | 497 | Running | $6,200 |
| 6 | 7 | #88 | Darrell Waltrip | Chevrolet | Gatorade | 160/10 | 497 | Running | $6,200 |
| 7 | 15 | #43 | Richard Petty | Dodge | STP | 146/0 | 494 | Running | $5,700 |
| 8 | 9 | #15 | Bobby Allison | Ford | Norris | 147/5 | 493 | Running | $5,600 |
| 9 | 13 | #90 | Dick Brooks | Ford | Truxmore | 138/0 | 492 | Running | $3,800 |
| 10 | 14 | #48 | Al Holbert | Chevrolet | Southland Industries | 134/0 | 492 | Running | $3,430 |
| 11 | 19 | #30 | Tighe Scott | Chevrolet | Russ Togs | 130/0 | 489 | Running | $3,120 |
| 12 | 16 | #92 | Skip Manning | Buick | Stratagraph | 127/0 | 486 | Running | $2,960 |
| 13 | 21 | #67 | Buddy Arrington | Dodge | Reid Trailer Sales | 124/0 | 485 | Running | $2,765 |
| 14 | 18 | #47 | Satch Worley | Chevrolet | Race Hill Farm | PE | 481 | Running | $1,350 |
| 15 | 6 | #2 | Dave Marcis | Chevrolet | Shoney's | 123/5 | 480 | Running | $2,005 |
| 16 | 17 | #40 | D.k. Ulrich | Chevrolet | Ulrich | 115/0 | 477 | Running | $2,320 |
| 17 | 25 | #52 | Jimmy Means | Chevrolet | Means Racing | 112/0 | 474 | Running | $2,135 |
| 18 | 23 | #64 | Tommy Gale | Ford | Sunny King Ford & Honda | 109/0 | 470 | Running | $1,900 |
| 19 | 8 | #05 | Bruce Hill | Oldsmobile | Bearfinder | 106/0 | 456 | Oil Pump | $1,000 |
| 20 | 22 | #01 | Earle Canavan | Dodge | Canavan Racing | 103/0 | 448 | Running | $900 |
| 21 | 32 | #19 | Dick May | Chevrolet | Belden Asphalt | 100/0 | 438 | Running | $1,440 |
| 22 | 34 | #45 | Baxter Price | Chevrolet | Tire King | 97/0 | 379 | Engine Failure | $1,405 |
| 23 | 1 | #27 | Buddy Baker | Chevrolet | M.C. Anderson | 99/5 | 363 | Cracked Cylinder Head | $1,845 |
| 24 | 36 | #34 | Nestor Peles | Chevrolet | Peles Racing | 91/0 | 360 | Driver Fatigue | $700 |
| 25 | 33 | #24 | Cecil Gordon | Chevrolet | Transmissions Unlimited | 88/0 | 306 | Running | $1,275 |
| 26 | 27 | #4 | Gary Myers | Chevrolet | Spencer's Baby Wear | 85/0 | 308 | Oil Pump | $650 |
| 27 | 31 | #79 | Frank Warren | Dodge | Native Tan | 82/0 | 302 | Engine Failure | $1,125 |
| 28 | 35 | #74 | Bobby Wawak | Chevrolet | Wawak | 79/0 | 261 | Transmission | $600 |
| 29 | 39 | #85 | Greg Heller | Ford | Triangle Springs | PE | 250 | Overheating | $575 |
| 30 | 29 | #61 | Joe Mihalic | Chevrolet | Norris | PE | 215 | Engine Failure | $550 |
| 31 | 20 | #17 | Roger Hamby | Chevrolet | Hamby/Ellis Automotive | 70/0 | 201 | Clutch | $1,040 |
| 32 | 26 | #25 | Ronnie Thomas * | Chevrolet | Louise Smith | 67/0 | 75 | Engine Failure | $1,030 |
| 33 | 11 | #3 | Richard Childress | Oldsmobile | Kansas Jack | 64/0 | 64 | Broken Valve | $1,120 |
| 34 | 12 | #70 | J.D. McDuffie | Chevrolet | Perry's Steak House | 61/0 | 35 | Oil Pump | $1,010 |
| 35 | 30 | #8 | Ed Negre | Dodge | Negre | 58/0 | 15 | Broken Oil Line | $1,000 |
| 36 | 37 | #29 | Bill Hollar | Chevrolet | Hollar | 55/0 | 14 | Transmission | $490 |
| 37 | 24 | #19 | Elmo Langley | Chevrolet | Gray | 52/0 | 5 | No Oil Pressure | $480 |
| 38 | 38 | #09 | Nelson Oswald | Chevrolet | Perfect Alignment | 49/0 | 5 | Accident | $470 |
| 39 | 40 | #80 | Wayne Morgan | Chevrolet | Wayne | 46/0 | 3 | Blown Head Gasket | $460 |
| 40 | 28 | #28 | Dave Dion | Ford | Dion Racing | 43/0 | 0 | No Value | $450 |
| * Denotes Rookie | |||||||||