They displace no more than 5.0 liters, rev no higher than 7,500 rpm and produce no more than 650 horsepower. The Holden Commodore's is based on the Chevy small block, the FPV Falcon's on a Ford crate engine and the Nissan Altima's on the Infiniti
M56. Erebus hasn't disclosed exactly what engine is in its Aussie racer, but we'd assume it is based on the M278 block you'd find in 500-series Mercedes road cars (which also forms the base for AMG's M157 and M152 engines). Along with the new Commodore, Falcon and Altima, the E63 racer will make its first public run in two days at the official test session in Sydney, following its race debut in Adelaide on March 3.