The engine is all aluminum with cast aluminum heads and a machined aluminum block. The result is a power plant with a fairly unique finish, and it has Hennessey and F5 logos machine-etched into the block. The block is reinforced with steel cylinder sleeves. The stamps are also forged. There is also an old-school pushrod design, instead of using double overhead cams. According to John Hennessey, the reason is mainly for packaging, as pushrod design results in a small, lightweight engine. The increase of the relatively small external size is a dry hose oil system.
Despite its physical size, the engine has a massive displacement of 7.6 liters, falling between the two figures previously reported to the engine. Feed the engine all the air it can consume are two large turbochargers at the end of tubular stainless steel heads giving maximum 22 to 24 psi. Power output is at least 1
Even with the engine finally revealed, not all specifications are final. Hennessey told us that production could be increased if more needed to beat the top speed of 301 mph. He said this is the starting point, though. He also stated that, while it is not being made to be a lightning-fast car, the company still operates on a 7-minute round on the Nürburgring. Hennessey will also build 24 copies, and 15 people have ordered it. The company has previously said that the car will cost $ 1.6 million.