The 620 engine was light for its time, weighing around 340 lb (154 kg), compared to 500 lb (227 kg) for the Maserati V12,[19] but in 3 litre Formula One form only produced around 300 brake horsepower (220 kW) at under 8000 revolutions per minute (rpm), compared to 330–360 bhp (250–270 kW) produced by the Ferrari and Maserati V12s.[20] However, it produced high levels of torque over a wide range of engine speeds from 3500 rpm up to peak torque of 233 pound feet (316 N·m) at 6500 rpm.[21] Installed in the lightweight BT19 chassis, it was also relatively fuel efficient; on the car's debut Brabham reported that the BT19 achieved 7 miles per gallon (40 L/100 km), against figures of around 4 mpg (70 L/100 km) for its "more exotic rivals".[15] This meant that it could start a Grand Prix with only 35 gallons (160 L) of fuel on board, compared to around 55 gallons (250 L) for the Cooper T81-Maseratis.[12] The engine had one further advantage over bespoke racing engines: parts were cheap. For example, the engine blocks were available for GB£11 each and the connecting rods cost £7 each.[18]