| | 1978 | Enduro Grand Nationals |
| | Ontario Motor Speedway | Ontario, CA |
| Finish | Driver | Hometown | Kart | Engine |
| | 100cc McCulloch Heavy |
| 1 | | Steve O'Hara | California | Hartman | Mc91B1 |
| 2 | | Kathey Hartman | Glendale, CA | Hartman | Mc |
| 3 | | Steve Derksen | California | Hartman | Mc91A |
| 4 | | Jim Wester | Richardson, TX | Hornet | Mc91B |
| 5 | | Kel McIntee | California | Hartman | Mc91B1 |
| 6 | | Kevin Medve | Texas |
| 7 | | Brian Espeset | Mankato, MN |
| 8 | | Hollis Brown | Simi Valley, CA |
| 9 | | Ron Gryczkowski | Racine, WI |
| 10 | | Fred Chuck | Indiana |
| 28 | | Charles Groeteke | St. Louis, MO |
| 30 | | Scott Pruett | Roseville, CA |
| | 100cc McCulloch Jr. |
| 1 | | Rod Tull | Ontario, CA | Hartman | Mc |
| 2 | | Jackie Hunt | Oklahoma | Hornet | Mc |
| 3 | | Tod Spaude | St. Petersburg, FL | Hartman | Mc92 |
| 4 | | Ralph Woodard | Omaha, NE | Red Devil | Mc91 |
| 5 | | David Dominguez | Nevada | ARM | Mc91 |
| 6 | | Scott Overbey | Burbank, IL |
| 7 | | Frank Canela | Sacramento, CA |
| 8 | | Mike Kay | Richardson, TX |
| 9 | | Gary Altinger | Edmonton, Alberta, Canada |
| 10 | | Bob Mackey | Bloomington, IN |
| 11 | | Scott Kuntze | California |
| 12 | | Chris Winkler | California |
| | 100cc McCulloch Light |
| 1 | | Kathey Hartman | Glendale, CA | Hartman | Mc |
| 2 | | Steve O'Hara | California | Hartman | Mc91B |
| 3 | | Scott Pruett | Roseville, CA | Margay | Mc91B |
| 4 | | Jerry Goodrich | Orange, CA | ARM | Mc91B |
| 5 | | Eddy Seider | Houston, TX | Hornet | Mc91B1 |
| 6 | | Greg San Marco | San Antonio, TX |
| 7 | | Steve Hamer | California |
| 8 | | Mark Arenal | California |
| 9 | | Larry Brown | Arizona |
| 10 | | Carol Becker | Indiana |
| | 100cc Open Heavy |
| 1 | | Mike Van Kralingen | Huntington Beach, CA | Van K | Komet |
| 2 | | Pete Muller | California | Henline K01 |
| 3 | | Kathey Hartman | Glendale, CA | Hartman | Komet |
| 4 | | Mark Dismore | Greenfield, IN | IKS | Corsair T-81 |
| 5 | | Mark Tilton | California | Van K | Komet |
| 6 | | Wally Baynes | Inglewood, CA |
| 7 | | Don McDonald | Sacramento, CA |
| 8 | | Curt Folley | Portland, OR |
| 9 | | Terry Ives | Citrus Heights, CA |
| 10 | | Phillip Lockwood | Oregon |
| 21 | | Kim Campbell | Dallas, TX |
| 23 | | Tony Adkins | Rowland Heights, CA |
| 29 | | Kyle Adkins | Rowland Heights, CA |
| 31 | | Randy Faulks | Jacksonville, IL |
| 33 | | Terry Hegar | Milwaukie, OR |
| 36 | | Mike Colver | California |
| | 100cc Open Light |
| 1 | | Pete Muller | California | Henline K01 |
| 2 | | Mike McAndrews | Omaha, NE | Bug | Komet 78 |
| 3 | | Greg Wright | Indianapolis, IN | Caretta | Komet 88 |
| 4 | | Curt Folley | Portland, OR | Hegar | Corsair T-80 |
| 5 | | Mark Tilton | California | Van K | Komet 78 |
| 6 | | Bob Hyman | Oregon |
| 7 | | Tony Colver | Alta Loma, CA |
| 8 | | Chris Shultz | Indiana |
| 9 | | Sheldon Orr | British Columbia, Canada |
| 10 | | Greg Davies | Edmonton, Alberta, Canada |
| 14 | | Tony Adkins | Rowland Heights, CA |
| 16 | | Lake Speed | Jackson, MS |
| 21 | | George Ito | Ventura, CA |
| | 100cc Piston Valve Jr. |
| 1 | | Kurt Burris | Fountain Valley, CA | Van K | Yamaha |
| 2 | | Tom Nields | Granada Hills, CA | Bug Wasp | Yamaha |
| 3 | | Rod Tull | Ontario, CA | Hartman | Yamaha |
| 4 | | Chris Winkler | California | Bug | Yamaha |
| 5 | | Joe Girosky | Oregon | Bug | Yamaha |
| 6 | | Jackie Hunt | Oklahoma |
| 7 | | Ditto Daughtrey | Texas |
| 8 | | Jerry Strawn | Oregon |
| 9 | | Ed Camp | Texas |
| 10 | | Gary Altinger | Edmonton, Alberta, Canada |
| 11 | | Mike Kay | Richardson, TX |
| 12 | | Scott Kuntze, Jr. | California |
| 13 | | Bob Mackey | Bloomington, IN |
| 14 | | Wes Obana | California |
| 15 | | Tod Spaude | St. Petersburg, FL |
| 16 | | Scott Overbey | Burbank, IL |
| | 100cc Piston Valve Sr. |
| 1 | | Scott Carroll | California | ARM | Yamaha |
| 2 | | Chuck Pittenger | Canoga Park, CA | Bug | Yamaha |
| 3 | | Don Burke | California | ARM | Yamaha |
| 4 | | Bobby Shiffert | Visalia, CA | Shiffert | Komet |
| 5 | | Brad Coleman | California | Van K | Yamaha |
| 6 | | Steve Markham | Prairie Village, KS |
| 7 | | Paul Singer | California |
| 8 | | Keith Williams | California |
| 9 | | William Lindvig | California |
| 10 | | Duke Castleton | Texas |
| 33 | | Mark Dismore | Greenfield, IN |
| 40 | | Gary Hartman | Norco, CA |
| 54 | | Jilene Chivel | Lakewood, CA |
| | 100cc Reed Open |
| 1 | | Steve Guccione | California | Caretta | Mc91B1 |
| 2 | | Kathey Hartman | Glendale, CA | Hartman | Mc |
| 3 | | Nick Adams | California | Caretta | Mc |
| 4 | | Dick Spoonts | Texas | Hartman | Mc |
| 5 | | Tom Steyer | Omaha, NE | Sabre | Mc91B |
| 6 | | Kevin Medue | Texas |
| 7 | | Wayne Kerr | Texas |
| 8 | | William Bowers | Texas |
| 9 | | Terry Woodard | Texas |
| 10 | | Steven Ahl | Nebraska |
| 19 | | Mark Dismore | Greenfield, IN |
| | 100cc Stock Heavy |
| 1 | | Brad Owens | California | Hartman | Corsair T-80 |
| 2 | | Fred Hamilton | California | Van K | Komet K-78 |
| 3 | | Don Holmboe | Oregon | A&N Special | Komet K-78 |
| 4 | | Wally Baynes | Inglewood, CA | IKS Maxi II | Corsair T- |
| 5 | | Edson Mitchell | California | Lancer | Komet K-88 |
| 6 | | Ron Welshons | Washington |
| 7 | | Bruce Swanhuyser | Hermosa Beach, CA |
| 8 | | Jim Bryan | Oklahoma |
| 9 | | Dan Larson | Oregon |
| 10 | | Ed Swopes | California |
| | 100cc Stock Light |
| 1 | | Gary Hartman | Norco, CA | Van K | Corsair |
| 2 | | Bill Shields | Oregon | Hegar | Komet |
| 3 | | Fred Dodge | Riverside, CA | Bug | Komet |
| 4 | | Scott Overbey | Burbank, IL | Van K | Komet |
| 5 | | Doug Henline | Anaheim, CA | Van K | Komet |
| 6 | | Dave Bradley | Tulsa, OK |
| 7 | | Tim Diamond | California |
| 8 | | Greg Wright | Indianapolis, IN |
| 9 | | Tony LaRocca | California |
| 10 | | Bruce Potter | California |
| 11 | | Dennis Ogami | California |
| 12 | | Howard Combee | Oregon |
| 23 | | Kim Campbell | Dallas, TX |
| 26 | | George Ito | Ventura, CA |
| 27 | | Mark Dismore | Greenfield, IN |
| 28 | | Tod Spaude | St. Petersburg, FL |
| | 125cc McCulloch |
| 1 | | Steve O'Hara | California | Hartman | Mc101 |
| 2 | | Hollis Brown | Simi Valley, CA | Bug | Mc101 |
| 3 | | Steve Derksen | California | Hartman | Mc101 |
| 4 | | Frank Milowicki | California | Caretta | Mc101 |
| 5 | | Syd Parsons | California | Hartman | Mc101 |
| 6 | | Sam Winkler | Corona, CA |
| 7 | | Wayne Brown | Dallas, TX |
| 8 | | Terry Ives | Citrus Heights, CA |
| 9 | | Phil Stillwell | Santa Ana, CA |
| 10 | | Tom Hunter | Hawthorne, CA |
| | 135cc Open |
| 1 | | Don McDonald | Sacramento, CA | McDonald | B-Bomb |
| 2 | | Bruce Swanhuyser | Hermosa Beach, CA | Shiffert | T-80 |
| 3 | | Alan Bassani | Yakima, WA | Hooper | BM130 |
| 4 | | John Hooper | Alta Loma, CA | Hooper | Colver 130 |
| 5 | | Jeff Clark | California | McDonald | Corsair T-80 |
| 6 | | Neal Poodry | Bason, NY |
| 7 | | Russell Thoede | Texas |
| 8 | | Don McDavitt | California |
| 9 | | Larry Kurplewski | Boise, ID |
| 10 | | Vernon Lambreath | Hutchinson, KS |
| | 200cc McCulloch |
| 1 | | Sam Winkler | Corona, CA | Bug | Mc91 |
| 2 | | Don Kistler | Anaheim, CA | Bug | Mc91 |
| 3 | | Harold Rank | California | Kobra | Mc |
| 4 | | Kevin Sterner | Nebraska City, NE | Red Devil | Mc91B1 |
| 5 | | Buck Pruett | Bell Gardens, CA | Bug | Mc91B1 |
| 6 | | Herb Yargus | Washington |
| 7 | | Jack Nelson | El Monte, CA |
| 8 | | John Lewis | California |
| 9 | | Jim Brzozowski | Houston, TX |
| 10 | | Sam Winkler | Corona, CA |
| | 270cc Open |
| 1 | | Don McDavitt | California | M&2 Eng. | Komet K99 |
| 2 | | Tom Kistler | Anaheim, CA | Bug | Yamaha |
| 3 | | Wesley Oakley | Margay | Komet |
| 4 | | Joe Helsley | Mesquite, TX | Margay | Komet K99 |
| 5 | | Dave Martin | California | Hornet | Komet K99 |
| 6 | | Jerry McDonald | Sacramento, CA |
| 7 | | Bob Bowen | California |
| 8 | | Scott Kuntze | California |
| 9 | | Merle Abbas | California |
| 10 | | Mark Dismore | Greenfield, IN |