Motor Trend 500 1966 var ett stockcarlopp ingående i Nascar Grand National Series (nuvarande Nascar Cup Series) som kördes 23 januari 1966 på den 2,7 mile (4,345 meter) långa road course-banan Riverside International Raceway i Riverside i Kalifornien. Totalt avverkades 499,5 miles (803,867 km) fördelat på 185 varv. Banunderlaget var asfalt. Loppet vanns för fjärde året i rad av Dan Gurney i en Ford på tiden 5:05.58 körande för Wood Brothers Racing. Gurneys snitthastighet uppgick till 97,952 mph. Det var Gurneys fjärde seger av totalt fem i cup-serien. Prispotten uppgick till 62 540 dollar, varav 18 445 dollar gick till segraren.
| Plc | Nr | Förare | Team/ bilägare |
Konstruktör | Start | Varv | Ledda varv | |
|---|---|---|---|---|---|---|---|---|
| 1 | 121 | Dan Gurney | Wood Brothers Racing | Ford | 2 | 185 | 148 | |
| 2 | 9 | David Pearson | Owens Racing | Dodge | 1 | 185 | 10 | |
| 3 | 99 | Paul Goldsmith | Nichels Engineering | Plymouth | 6 | 183 | 0 | |
| 4 | 41 | Curtis Turner | Wood Brothers Racing | Ford | 3 | 183 | 27 | |
| 5 | 29 | Dick Hutcherson | Holman Moody | Ford | 10 | 182 | 0 | |
| 6 | 56 | Jim Hurtubise | Norm Nelson | Plymouth | 9 | 182 | 0 | |
| 7 | 22 | Billy Foster | Rudy Hoerr | Dodge | 12 | 181 | 0 | |
| 8 | 11 | Ned Jarrett | Bondy Long | Ford | 8 | 178 | 0 | |
| 9 | 1 | Norm Nelson | Norm Nelson | Plymouth | 14 | 176 | 0 | |
| 10 | 18 | Ron Hornaday | i.u. | Mercury | 19 | 171 | 0 | |
| 11 | 4 | Jerry Grant | Tom Friedkin | Chevrolet | 16 | 171 | 0 | |
| 12 | 24 | Bobby Allison | Betty Lilly | Ford | 34 | 169 | 0 | |
| 13 | 2 | Johnny Steele | Kyle Gibson | Mercury | 23 | 164 | 0 | |
| 14 | 98 | Don White | Nichels Engineering | Dodge | 5 | 162 | 0 | |
| 15 | 10 | Don Walker | i.u. | Ford | 27 | 154 | 0 | |
| 16 | 71 | Mario Andretti | Bondy Long | Ford | 25 | 154 | 0 | |
| 17 | 63 | Walt Price | i.u. | Buick | 38 | 154 | 0 | |
| 18 | 61 | J.T. Putney | Toy Bolton | Oldsmobile | 44 | 150 | 0 | |
| 19 | 68 | Bob Derrington | Bob Derrington | Ford | 41 | 146 | 0 | |
| 20 | 8 | Jerry Oliver | i.u. | Chevrolet | 40 | 144 | 0 | |
| 21 | 48 | James Hylton | Bud Hartje | Dodge | 17 | 128 | 0 | |
| 22 | 7W | Jack McCoy | i.u. | Dodge | 30 | 123 | 0 | |
| 23 | 45 | Carl Cardey | n/a | Ford | 35 | 119 | 0 | |
| 24 | 33 | Clem Proctor | Clem Proctor | Ford | 18 | 114 | 0 | |
| 25 | 43 | Richard Petty | Petty Enterprises | Plymouth | 7 | 105 | 0 | |
| 26 | 27 | Cale Yarborough | Matthews Racing | Ford | 11 | 103 | 0 | |
| 27 | 89 | Cliff Garner | i.u. | Mercury | 29 | 98 | 0 | |
| 28 | 00 | Dick Guldstrand | i.u. | Chevrolet | 31 | 65 | 0 | |
| 29 | 26 | Bobby Isaac | Junior Johnson & Associates | Ford | 15 | 55 | 0 | |
| 30 | 21 | Marvin Panch | Wood Brothers Racing | Ford | 4 | 45 | 0 | |
| 31 | 47 | A.J. Foyt | Junior Johnson & Associates | Ford | 13 | 45 | 0 | |
| 32 | 198 | Eddie Gray | Ralph Shelton | Mercury | 21 | 43 | 0 | |
| 33 | 126 | Carl Joiner | Joiner Racing | Chevrolet | 24 | 41 | 0 | |
| 34 | 55 | Tiny Lund | Lyle Stelter | Ford | 32 | 34 | 0 | |
| 35 | 9 | Skip Hudson | i.u. | Chevrolet | 22 | 30 | 0 | |
| 36 | 145 | Scotty Cain | Bill Clifton | Mercury | 20 | 20 | 0 | |
| 37 | 3 | Bruce Worrell | i.u. | Plymouth | 36 | 15 | 0 | |
| 38 | 16 | Jim Cook | Floyd Johnson | Oldsmobile | 42 | 14 | 0 | |
| 39 | 34 | Clyde Prickett | i.u. | Ford | 33 | 11 | 0 | |
| 40 | 74 | Gene Black | Gene Black | Ford | 26 | 4 | 0 | |
| 41 | 06 | Dave James | Jim Whitehead | Plymouth | 28 | 4 | 0 | |
| 42 | 14 | Joe Clark | Bob Bristol | Mercury | 37 | 4 | 0 | |
| 43 | 111 | Arley Scranton | Arley Scranton | Mercury | 39 | 3 | 0 | |
| 44 | 38 | Charles Powell | i.u. | Ford | 43 | 1 | 0 | |
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