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I thought that the '69S exhaust valves were sodium filled.
Years ago I asked the guy who does my heads about Porsche's use of Sodium filled valves and he said something to the effect that he hadn't seen it or at least hadn't seen the warning on the valve boxes that usually indicates sodium filled valves (instructions on how to dispose of them?).
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
http://members.rennlist.org/messinwith911s/
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