Page "Cosworth" Paragraph 52

In mid 2003, Cosworth provided the 3. 5 L V8 XG badged as a Chevrolet Gen 4 engine to IRL IndyCar Series teams after the proprietary Chevrolet Gen 3 engine proved inadequate against rival Hondas and Toyotas during the 2003 season.

While many teams left Chevrolet after the 2003 season, those that stayed saw a significant improvement in performance with the new " Chevworth " engine compared to their previous units.

The XG finished second in its first race at Michigan on July 27, 2003.

Sam Hornish, Jr. went on to win 3 races that season with the new XG.

The XG was reduced in size to 3 L for 2004 season and it won one race in 2005 during Chevrolet's final season in IRL.