These heads start off as a 'ported and flowed' spec but in addition to this (depending on valves used) the ports are opened out further and the 3 angled seats are cut for maximum smooth flow at high and low rev range. This makes sure you will get the best all round power on the road or track days. Plasma nitrided stainless steel valves are used, bronze or cast guides can be used with these valves. Prices start from £1450. Please get in touch for your requirements.