Sodium filled valves are bigger and would both increase static compression AND reduce pre-spark mixture temperatures.
What SRT valve sizes/stem lengths did Chrysler factory install lately?
Thermal barrier coating would also “suck up” additional CC’s
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The sodium hemi valve stems are about .200 longer than a magnum exhaust valve. There are some older small block chevy sodium valves about the right length but 11/32 v/s 5/16 stem and 1.55 diameter. If a valve job and guides were needed they would likely work but I have not test fit one. If hardened seats were wanted or needed they would work for sure.
The 6.4 is the only one I know of with sodium ex valves and they are 1.65 VS 1.6 magnum valves butt like you mentioned just eyeballing them next to a magnum valve are about .200 longer. They are also dented in so no compression bump.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
