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Jeff, Thanks very much for cutting photoing and posting. When I get some I'll do a longitudinal cut w/ our 50hp bandsaw.
The same valves from 3 different manufacturers were used from '76 C3 thru '89 Carrera.
Except as noted previously.
The 930s thru '89 did use sodium cooled exhaust valves.
The 964 used sodium filed valves for weight reduction on 964 intakes but not on 964 exhausts(Jeffs pic is a 964 exhaust valve).
993 did the same except 993RS which has sodium in both intakes and exhausts.
Now here's another one that some of you won't believe
The 3.6 liter 964 M64/50 doesn't have sodium filled valves either.
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