These are the ultimate machines in which to go Autograss Racing, with no limits on engine capacity or tuning, once again in lightweight mid-engined single-seaters. V6 and V8 engines once dominated and the popularity and reliability of the Ford V6 and Rover or Chevy V8 engines means that it's still possible to race in this exciting class on a limited budget at club level, although the professionally built twin bike-engined cars now rule the roost at the bigger meetings.