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JerryCPP(WA) (PIC) 10-23-2009 14:52:00 71.115.236.186 33028 Report to Moderator

I've been away from the machine shop/parts business for 25 years, but when i was there we asked the same question. Answer? They already have the equipment to build the original valves, so why change? A sodium filled valve stem conducts heat away from the valve head far better than solid metal. Sodium filled valves were quite common in the big and industrial engines, and in many aircraft engines of the time. [Reply]  [Send Email]