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>> Mahle is actually making valves with hollow stems and stamped from >> metal. > Could these be sodium filled? One of they guys I work with has > drilled out motorcycle valves, added a bit of sodium, and welded the > hole shut. The hole is in the head end; the stem end is hardened. > There were 9mm sodium-filled valve stems in some 1600cc VW campers - not sure what others. I imagine a hollow empty stem would not transfer heat as easily as you'd want. Does the sodium fill it completely? 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~