![]() ![]() from 11.99 Long Shank Double Cut Carbide Rotary Files from 61.99 Open Fluted Long Shank Aluminum Rotary Files from 51.99 PF-32 : Porting & Polishing Machining Aid 43.99 PRK-99 Intake Port-Reshaping Kit 41. Couple head porting with a performance camshaft with a nice high valve lift and there can be some serious potential for higher upper rev range power output. DPK-100 : Deluxe Porting & Polishing Kit 109.99 Lapping Oil 4 oz. The slight expansion of the inlet and outlet ports will slightly change the way in which your engine creates power however torque will be sacrificed lower in the rev range due to the decrease in fluid velocity due to the new expansion of the port, but power gains will be had high in the rev range as a larger volumetric flow rate of air and fuel can makes its way into the cylinders. If you believe online forum chatter, LS1 cylinder heads can give anywhere between 10 to over 50bhp extra from a port and polish, so it is by no means a linear process. Don’t expect huge leaps in horsepower results obviously depend on the original state of the cylinder head and the quality of the workmanship. Once power increases from other methods have been maxed-out to a point, head porting can be a great next step to producing another incremental power jump. ![]() Combustion chamber – polishing of the area that makes up the top of the combustion chamber (housing the spark plug) is conducive to efficient exhausting of the cylinder, with a polished finish allowing a smooth transition of the combusted air/fuel mixture out of the cylinder and into the exhaust manifold.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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