The Aventador LP 700–4 used Lamborghini's 700 PS (515 kW; 690 hp) 6,498 cc (6.5 L; 396.5 cu in) 60° V12 engine, weighing about 235 kg (518 lb). Known internally as the L539,[15] it was Lamborghini's fifth in-house engine and second V12 design since the 3.5-litre power plant found in the 350GT.[19]