SBR, 888, BJR and PCR use SBR developed Ford V8's, while HRT, HSVDT and Perkins Engineering use HMS developed Holden V8's while the rest of the Holden teams use their own developed Holden V8's) leading to minor/major (depending on teams) engineering differences among teams despite the cars being the same make.
SBR, 888, BJR and PCR utilize SBR-developed Ford V8s, whereas HRT, HSVDT, and Perkins Engineering employ HMS-developed Holden V8s. The remaining Holden teams use their own in-house developed Holden V8s, resulting in minor to significant engineering variations among the teams despite sharing the same make.