Nize:
The older oem Porsche sodium filled valves were made of a different allow and hollow and filled with sodium for improved heat transfer such that the valves would not break and keep them cooler above 900'F.
The newer Stainless Steel alloy valves provide strength, cool better and longevity to the valve train system Turbo or non turbo. There are no issues at all. Cost is ~40 to 50% less and easier to obtain and manufacture.
These are
Quality Controlled ISO 9001/9002 manufactured custom pieces made in the USA.
PM me if needed.
Later...
__________________
Guru944
2006 955 Cayenne S Titanium Series - Marine Blue, 1987 Porsche 944S Club Sport.
1987 Buick Turbo-T Lightweight "Great White", +500HP, TA49 Turbo.
http://www.blackbirdmotorsports.com,
944/951/968, 911 and 955/957 Performance Solutions.
Thank you Lord, for your Loving Kindness, Tender Mercy, and Grace. Only You are Faithful.