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> > As for stretching valves, this has been proven by VW back in the '60's > > to be caused by worn exhaust guides. > > So, are you saying that exhaust valves DO sometimes stretch? If so, > how much might one stretch? > > How does the worn guide cause this? > Worn guides allow the valve to seat off-square, which I guess increases the stress on that part of the stem. Certainly that's the thinking behind valve heads breaking off. Is it a reasonable assumption to expect that some elongation might occur before fracture? Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~