Grindlay Peerless was a typical manufacturer in that they made their own frames and tanks and used proprietory engines, wheels, forks and gearboxes. This 999cc Barr and Stroud V-Twin engine sets the Grindlay Peerless apart from the other machines of its era. Barr and Stroud built sleeve-valve motors frequently used to power early aircraft. It needed far less maintenance than a traditional side-valve engine. $AUD70k maybe.