This is really where the power lies. We can either modify the standard 5 port design or alternatively use the Arden 8 port crossflow head which gives much more torque (be warned though, the latter option is not cheap). Our cylinder heads are always to the highest specifications as we don’t know how else to make them. This means that they are all ported and gas flowed to competition levels. The compression ratio and valve sizes are selected according to your needs. We use stainless steel competition valves and phosphor-bronze valve guides in all our engines. For fast road and rally cars we fit unleaded valve seats. Lightened top caps, roller-tipped high lift rocker assemblies and Iskenderian valve springs can be supplied as necessary.