Top Doorslammer is a professional (Pro) class of Australian drag racing. It caters to full-bodied racing sedans which are replicas of Australian or US production vehicles. The class uses 514 cu. in. displacement (8.5-litre), mechanically supercharged V8 engines which are fueled by methanol. The minimum weight break for these vehicles is 2700 lbs (1225 kg). It is similar to the Pro Modified class as defined by the NHRA.