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They often have a cap on top of the valve stem that the rocker rides on. As I understand the Sodium filled valves have a tendency to break. Chuck
Y's guys rule! Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.
  MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi) Manchester, New Hampshire
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I've heard of Ford HD 292 engines having exhaust valve stems that were sodium filled. Cliff reported in another thread that the stems were ~7/16 in diameter, but I haven't seen any prior to this. WoW!  Click the link below to see pictures of the engine for sale on eBay with a cylinder head picture that shows the size of the exhaust valve stems adjacent to the intake valve stems. http://www.ebay.com/itm/Used-Ford-292-V8-Engine-/112160346844?hash=item1a1d4712dc:g:5OsAAOSwOyJX9~cv
NoShortcuts a.k.a. Charlie Brown near Syracuse, New York
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