![]() Valve seat – a particularly tricky job that should almost definitely be attempted only by someone with access to CNC equipment, this modification will make sure that the valves create an exact seal with the valve seat when closed, thus improving the volumetric efficiency of the engine.Valve throat pocket – possibly the most important area to have smoothed and widened, promoting the efficient movement of flow through the throat by smoothing off any edges and chamfers left by factory machining.Port matching also applies to the inlet manifold, making sure that it is a precise fit Changing the entire orientation of the inlet port can also be an extreme but effective form of head porting, like changing the angle of the port in relation to the runner from the inlet manifold to minimise disturbance of the fluid flow. Inlet ports – material can be shaved to relieve the port of ruts and unwanted metal from casting, but keeping a certain surface roughness so to encourage any fuel deposited on the port sides to evaporate.Port matching with the exhaust manifold can also be conducted, making sure there is no change in diameter between either components which could cause a restriction otherwise. Exhaust ports – material can be shaved especially from the top of each exhaust port, where the highest velocity air is found exiting the cylinder.There are many areas within the cylinder head that can be attended to:
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