 In 2002 in an effort to have an Australian car manufacturer competing in the top category and to have them competitive rather than just making up the numbers, PROCAR allowed Holden to use the 7.0 litre, 427 cui GM LS6 V8 engine (as used successfully at Le Mans in the Chevrolet Corvette C5-R and C6-R's) instead of the 5.7 litre Gen III V8 as used in the Monaro CV8 road cars.This caused some controversy as it was felt that allowing Holden to use a larger engine than available in the road cars gave them an advantage over their rivals, with some fans feeling that this decision was a big factor in the eventual demise of the series.PROCAR's given reason was that it allowed the Monaro's to better compete with the V12 and V10 engine cars as well as the lighter V8 and H6 (flat-six) cars.