Audi cylinder head with 5 valves and camshaft adjustment recognition of the arrangement of the five-valve technique operation of the valves by use of weaker springs recognition of the channels by varying colours Porsche camshaft adjustment can be operated description ordernumber 1288 see also: Common-rail high pressure pump with fuel-delivery regulation valve nozzle holder with two-spring injection nozzle and needle-displacement sensor electric fuel pump four-valve cylinder head, diesel direct injection, lorry