The Spitfire XII was a dedicated low-level interceptor and introduced the Griffon engine with 1,735 hp. The Griffon made the Spitfire 3 foot longer and the nose had to have two large bulges above the exhaust ports to accommodate the cylinder blocks of the new engine. The XII gave the R.A.F. something that could catch the FW 190 at low level, being capable of 350 m.p.h. at sea-level. All the Mark XIIs had clipped wings to give increased low-level performance. They all had pointed tail-fins and an armament of two cannons and four .303 machine-guns. Later ones in the production run had retracting tail-wheels. 100 were produced.