The amount of power an engine can produce depends on the quantity of fuel and air it can burn. To enable good gas flow through the cylinder head we offer a range of inlet and exhaust valves that offer improved design and are also available as an oversize.
QED HiFlo Even when the valves are fully open they still cause interference with the gasflow through the port because the valve stem sits in the middle of that flow. With our HiFlo valves this interference is minimised by reducing the valve stem diameter over the interfering section of the inlet valves. Of course this also helps to reduce the weight of the valves and the associated load on the valve train
Oversize For even greater improvment we can also supply our HiFlo design valves, with an oversized head. These have all of the advantages of a wasted valve stem but also feature a +1mm valve head diameter.