| Budweiser 500K | |
| First Race: | 1967 |
| Last Race: | 1983 |
| Distance: | 313.5miles |
| Laps: | 95 |
| Previous Names: | Rex Mays 300 (1967–1969) Los Angeles Times 500 (1981) AirCal 500K (1982) Budweiser 500K (1983) |
| Most Wins Driver: | Dan Gurney (2) Rick Mears (2) |
| Most Wins Team: | Team Penske (2) |
| Most Wins Manufacturer: | Chassis: Engine: |
The Budweiser 500K was an automobile race sanctioned by CART, it was held at Riverside International Raceway in Riverside, California. The event was held from 1967 to 1969 and again from 1981 to 1983.
From 1967 to 1969 Riverside served as the season-ending USAC championship race, the 1967 race was the last for Jim Clark in USAC before his death in April 1968.[1] The race was replaced by the California 500 at Ontario Motor Speedway for 1970.
After Ontario Motor Speedway closed in 1980, Riverside returned in 1981 as a CART event. The series dropped Riverside in 1984. Riverside County would not host another major race for Indy cars until 2024, when The Thermal Club in Thermal, California, in Riverside County, California, was announced as the host of the INDYCAR Thermal $1,000,000 Challenge.
| Season | Date | Driver | Team | Chassis | Engine | Race Distance | Race Time | Average Speed (mph) | Report | Ref | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Laps | Miles (km) | |||||||||||
| USAC Championship Car history | ||||||||||||
| 1967 | November 26 |  Dan Gurney | 120 | 312.000 (502.115) | 2:48:51 | 107.17 | Report | [2] | ||||
| 1968 | December 1 | Dan Gurney | 120 | 312.000 (502.115) | 2:42:01 | 111.689 | Report | [3] | ||||
| 1969 | December 7 | Mario Andretti | STP Corporation | Hawk | Ford | 120 | 312.000 (502.115) | 2:50:08 | 105.797 | Report | [4] | |
| 1970–1980 | Not held | |||||||||||
| CART Indy Car World Series history | ||||||||||||
| 1981 | August 30 | Rick Mears | Team Penske | Penske | Cosworth | 95 | 313.500 (504.529) | Report | [5] | |||
| 1982 | August 29 | Rick Mears | Team Penske | Penske | Cosworth | 95 | 313.500 (504.529) | Report | [6] | |||
| 1983 | August 29 | Bobby Rahal | Truesports | March | Cosworth | 95 | 313.500 (504.529) | Report | [7] | |||