Austin Mini Head Unleaded Mpi Performance With Road Valves

MPI specification of cylinder head, based on used core castings, modified in true Road sport style to maximise on-road performance for those wanting maximised drive-ability when used with mild to fast-road camshaft specifications. That means optimised torque out-put through port shape and dimension development and valve throat shapes developed to work with the aforementioned camshaft types, along with suitable compression ratios given modern lead-free fuel specifications. Genuine Rover copper-beryllium lead-free exhaust seat inserts are fitted. High quality cast iron guides are used along with the latest specification chrome stemmed standard MG Metro valves (35.7mm inlet and 29.3mm exhaust) and 180lb (nominal at maximum valve lift) double valve springs to give a cylinder head capable of withstanding a maximum continual peak rpm limit of 6,500rpm and 0.475" valve lift. Combustion chambers are set at an average 21.4cc since most of these engines are already running a relatively high compression ratio (CR) and their efficiency will boost dynamic CR considerably. 9-stud fitting as standard. This head has no heater take-off port and no by-pass hose adapter fitted.