Mezue ahịrịokwu na-esonụ: Brock na-akwọkwa Holden Monaro 427C maka Garry Rogers Motorsport (GRM), na-emeri anọ n'ime agbụrụ anọ n'ime ihe a na-eche na ọ bụ otu ihe na-egosi na agbụrụ nkwado maka
2003 Australian Grand Prix na Melbourne. Nke a dugara ya ịnya ụgbọ ala nke abụọ nke Monaro nke GRM wuru ma na-agba ọsọ na Australian Nations Cup Championship, asọmpi ụdị GT maka ụgbọ ala okporo ụzọ gbanwere nke ọma na nke pụrụ iche na 2003 tupu ya ehiwe otu nke ya maka onwe ya na nwa ya nwoke James na 2004 (ya na Monaros nke GRM nyere). O nwetara mmeri nke iri na Bathurst na 2003 na Bathurst 24 Hour, mgbe o meriri, ya na Greg Murphy, Jason Bright na Todd Kelly na GRM Monaro ya, nke arụmụka na-arụ ọrụ site na 7.0L 427 cui V8 engine kama nke 5.7L Gen III dị ka eji ya eme ihe Monaro CV8 (esemokwu ahụ sitere na ụgbọ ala ọzọ na Nations Cup na-enweghị ike ịgba ọsọ dị iche iche. Onye mmeri nke iko mba atọ bụ Jim Richards kpọrọ Monaro dị ka "Better V8 Supercar" mgbe ọ pụtara na Bathurst 24 Hour nke 2002.