A modern BriSCA F1 configuration is front-engined, rear-wheel drive, and open-wheeled, with the driver located centrally. The cars are constructed on race engineered steel ladder chassis with robust roll-over-safety cages and aluminium sheet body panelling, There is no limit in engine capacity or number of cylinders but engines must be naturally aspirated (no fuel injection, no supercharging or turbo charging permitted) and the engine blocks must be cast iron. The most common engines used, due to their reliability and availability, are based on the American Chevrolet V8 engine in both small block (350 ci) 5.7 litre and big block (454 ci) 7.4 litre varieties, producing upwards of 740 bhp with approx 640 ft-lbs of torque but some cars are known to have been equipped with engines of 9 litre capacity (540 ci). Power is most typically delivered through a 'Doug Nash' style gearbox with two forward gears (one for racing) and reverse, and use a heavily modified Ford Transit rear axle with a locked differential.