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Message: <blockquote data-quote="celicacultus" data-source="post: 3385645" data-attributes="member: 28490">Proper porting and polishing will be able to create a slight swirl in the airflow into your combustion chamber, like a vortex effect, normally you want to polish the inlet port, flatten and smoothen any cylinder head casting flaws that will cause air turbulence. Just enlarging the inlet port is not the answer, it's the angle of the port. The valve guides should be pump out for a good port and polish job and I have seen some that go as far as to cut the valve guides. 3 or 5 angle valve job will allow smoother air flow when the valves are open and minimize the chance of the air/fuel mixture of forming fuel droplets around the rim of the valvesTo remove the carbon is decarbonizing. You will "remove" metal when porting. need short and long porting tools, then use sandpaper polishing tools to smoothen, they're like lollipop candy shapefor N/A cars, personally, I can hardly feel the improvement, maybe must include improvement to the throttle body, inlet manifold, plenum and runners. because if you port and polish the inlet opening on the cylinder head to the gasket size, the inlet manifold side must be done as well.for F/I, well there are other and simpler things you can do to get the extra air into the chamber.</blockquote>

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