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On 2 Sep 2002, at 23:13, Martinez, Leon wrote: > I did notice that the head was made without much casting > protrusions around the valve stem area below the valve head, > giving it more flow. This was usually a trick with flowing > a head by grinding these off, including the valve stem. > On the Mexican head , the valve stem only sticks out without > the casting protrusions. In the section of the Bill Fisher book, as well as in Bergs head flowing paper, they point out that grinding off that protrusion around the valve guide in the exhaust port, is counterproductive. I'd be worried that this may have reduced heat flow from the hottest part of that guide and might increase wear there. Apparently it also reduces flow, a very counterintuitive result, I agree. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/