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Illustrated: Ported and Polished Ports
Illustrated: Ported and Polished Ports
Porting and Polishing: One of the best ways to get extra 'power' out of your engine is to port and polish your cylinder heads. Anyone who's been in the engine business for any length of time will tell you that one of the best ways to increase horse power in just about any engine is to (among other things) port & polish (P&P) the cylinder heads. How far you go with porting really depends what you are trying to accomplish with your motor and how you plan to drive it.
Porting and Polishing (P&P) is the removing of material from the intake/exhaust ports as well as the Combustion Chambers for the reason of improving flow both in AND out of the combustion chambers. Stock heads are made from cast aluminum and if you look at the intake and exhaust ports, they are a very rough and have lots of sharp edges.

PORTING is when you carefully grind away this un-necessary material smoothing the flow paths for the intake and exhaust gasses. Every protruding little point in that path restricts the flow of air causing your engine to work harder both sucking in the fuel/air mixture and then pushing out spent exhaust gasses. By removing these large ridges and smoothing the flow path, you have enabled your engine to more efficiently ingest and expel air. If done correctly, this can translate into impressive HP gains.

POLISHING the surfaces of your combustion chambers and exhaust ports reduces the drag coefficient of those surfaces making it even easier to ingest and expel gasses.
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