The thirty-fifth annual Winchester 400 motor race (run yearly since 1970) was held under Champion Racing Association sanction on October 5, 2003, at the Winchester Speedway, Indiana (USA).
| Results of the 34th Annual Winchester 400 | |||||||
|---|---|---|---|---|---|---|---|
| Pos | Start | Car # | Driver/Hometown | Sponsor/Make | Laps | Status | |
| 1 | 8 | 21 | Bobby Parsley / Shepherdsville, KY | Crown Spray Power/Parsley Racing / Chevrolet | 400 | running | |
| 2 | 10 | 72 | Scott Hantz / Pleasant Lake, IN | EMF CorporationFinish Line Fabricating / Ford | 400 | running | |
| 3 | 11 | 78 | Bull Baker / Daleville, IN | Car Brite/Stoops Automotive/Cooper Tire / Chevrolet | 400 | running | |
| 4 | 24 | 71 | Ray Skillman / Greenwood, IN | Dupont Automotive Finishes/Kendall Oil / Ford | 400 | running | |
| 5 | 30 | 16 | Evan Jackson / Gaston, IN | King Motorsports / Chevrolet | 398 | running | |
| 6 | 4 | 55 | Chuck Barnes Jr. / Louisville, KY | Gladiator Garage Works/City Farm Hams / Chevrolet | 395 | running | |
| 7 | 1 | 45 | Dave Jackson / Loveland, OH | Tri State Sterling Trucks / Chevrolet | 393 | running | |
| 8 | 9 | 63 | Jim Crabtree, Jr. / Muncie, IN | Jim’s Automotive Service / Chevrolet | 392 | running | |
| 9 | 7 | 26 | Rick Turner / Yorktown, IN | Great Deals/Midas Auto Experts / Pontiac | 390 | running | |
| 10 | 16 | 8 | Scott Whitehouse / Greenfield, IN | Whitehouse Motorsports / Ford | 380 | running | |
| 11 | 21 | 80 | Tom Hernly Jr. / Lansing, MI | Sawyer’s Pontiac/Smalley’s Auto Repair / Chevrolet | 374 | running | |
| 12 | 31 | 49 | Tim Sibila / Massillon, OH | Sibila Race Engineering/Muller Motorsports / Pontiac | 358 | running | |
| 13 | 20 | 34 | Tim Phillips / Kalamazoo, MI | Advanced Automotive / Chevrolet | 342 | accident | |
| 14 | 3 | 11 | Jeff Lane / Knightstown, IN | Ed Martin Automotive Group / Chevrolet | 320 | accident | |
| 15 | 17 | 4 | Scott Wolfe / Decatur, IN | Rug Doctor/Embosstek/MyWheel.com / Chevrolet | 317 | electrical | |
| 16 | 22 | 83 | Tom Gray / Indianapolis, IN | G2 Motorsports/Car Brite / Chevrolet | 315 | running | |
| 17 | 19 | 23 | Eddie Van Meter / Indianapolis, IN | Muller Motorsports/Skiles Auto Parts / Dodge | 309 | running | |
| 18 | 12 | 94 | Todd Oliver / Indianapolis, IN | Sunoco/Heineken/Muller Motorsports / Chevrolet | 268 | overheating | |
| 19 | 25 | 48 | Bobby Murany / Mt. Morris, MI | Go Go Auto Parts / Chevrolet | 194 | engine | |
| 20 | 6 | 66 | Junior Hanley / Waterdown, ONT, CAN | Big Rigs Truck & Trailer Maintenance / Chevrolet | 174 | Steering | |
| 21 | 15 | 81 | Terry Fisher Jr. / Ossian, IN | C & P Machine/X102.3 FM / Chevrolet | 163 | suspension | |
| 22 | 13 | 2 | Kenny Tweedy / Greenfield, IN | Keith Electric/Main Street Consulting / Chevrolet | 154 | Transmission | |
| 23 | 14 | 06 | Terry Fisher Sr. / Ossian, IN | C & P Machine/Bailey Trucking / Chevrolet | 146 | overheating | |
| 24 | 2 | 84 | Kyle Busch / Las Vegas, NV | Hendricks County Motorsports / Chevrolet | 130 | accident | |
| 25 | 33 | 14 | Rowdy Embry / Rockford, IL | Go-4-It Scooters / Chevrolet | 101 | Transmission | |
| 26 | 29 | 08 | Billy Shotko / West Olive, MI | Ponstein Racing/Glasstree.com / Pontiac | 99 | suspension | |
| 27 | 5 | 10 | Chris Gabehart / Louisville, KY | Hendricks County Motorsports / Chevrolet | 86 | accident | |
| 28 | 18 | 5 | Chet Blanton / Plainfield, IN | ARC Racing Engines / Chevrolet | 45 | accident | |
| 29 | 27 | 67 | Robert Amos / Indianapolis, IN | Washington Square Dairy Queen / Chevrolet | 44 | accident | |
| 30 | 28 | 00 | Andy Ponstein / Hudsonville, MI | Great Deals Coupon Magazine / Ford | 11 | accident | |
| 31 | 23 | 155 | Chuck Barnes Sr. / Louisville, KY | Gladiator Garage Works/Cintas / Chevrolet | 3 | vibration | |
| 32 | 26 | 3 | Keith Ousley / Warsaw, IN | Advanced Automovice / Chevrolet | 2 | ignition | |
| 33 | 32 | 134 | John Conklin / Anderson, IN | Advanced Automovice/Cobra Racing / Chevrolet | 1 | handling | |
| Preceded by 2002 Winchester 400 |
2003 Winchester 400 Winner: Bob Parsley |
Succeeded by 2004 Winchester 400 |