John Rodgers wrote

Anybody know if there are sodium filled valves available that will fit
the WBX heads. If so, what are the sources?

JohnVW makes the sodium valves the list price is $64 each. I use the a good Italian valve with no problems I have seen exhaust seats take a beating in vans that are driven to hard for to long as in above 4000 rpm but I have not seen the need for the sodium valves. Sodium valves need extra clearance in the valve guide because they transmit heat down the stem are you sure you want to transmit heat down the stem. In my own vans I use a non hardened seat made ofnickel the same seat I use in the propane engines I build for Zambonis and type 4 engines  Bob Donalds all rights reservedhttp://www.bostonengine.com
     

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