Head work for 4KQT project

[Ken Keith]

So, just the exhaust valves are sodium filled on the MC heads?  I 
had thought before that it was "sodium filled valves", not limited to 
the exhaust ones only.

Thanks,

Ken

JShadzi at aol.com wrote:
>
> wphelps at rizzo.com writes:
> 
> << For those of you who have done the conversion, is it worth having the 
> sodium valves put in the 4K head so I can keep the vacuum pump? Are there any other
>  differences between the 4K and 5KT heads?? (The donor car was an 86 5KT)   >>
> 
>     Yes, definitely do it, that is what I did on my 80qt.  When you see the 
> turbo and manifold glowing cherry red, you can imagine how much a beating 
> those exhaust valves are taking, the sodium is extra insurance against having 
> to pull the head and replace valves more than once.  Other than the exh. 
> valves, there are no real differences between the heads.  BTW-I also fit 40mm 
> intake valves from the later NG/NF motors too, you will have to put in bigger 
> seats but it all fits fine.
> Javad