Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Season | Date | Driver | Chassis | Engine | Series | Report |
| --- | --- | --- | --- | --- | --- | --- |
| 1967 | August 6 | Mario Andretti | Brawner Hawk | Ford | USAC Championship Car | report |
| 1968 | August 4 | Mario Andretti | Brawner Hawk | Ford | USAC Championship Car | report |
| 1969 | September 7 | David Hobbs | Surtees | Chevrolet | SCCA Formula 5000 | report |
| 1970 | August 1 | George Follmer | Lotus | Ford | SCCA Formula 5000 | report |
| 1971–2006: Not held | 1971–2006: Not held | 1971–2006: Not held | 1971–2006: Not held | 1971–2006: Not held | 1971–2006: Not held | 1971–2006: Not held |
| 2007 | July 1 | Robert Doornbos | Panoz | Cosworth | Champ Car World Series | report |
Question:
Which engine is responsible for the USAC Championship Car?
Answer:
Ford, Ford