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> Stock valves are not sodium filled. I agree. I think the 9mm dia. stem exhaust valves as used in the later upright air-cooled engines are sodium filled. I don't know if any others got them - Type 4 has 9mm stems on exhaust valves, so maybe they are. 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