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Head porting..what to avoid.. 120-130

posted by  Rhys on  Sun May 25 09:34 CST 2008
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

It's not Volvo specific to my knowledge. If there is a spot to stay away from it is the "short side radius", which is the floor of the port on both intake and exhaust. That profile should be blended at the valve seat, but the radius must not be flattened at all. That may be the area that gives rise to the horrible predictions of lower performance.






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