Head work for 4KQT project

[Ameer Antar]

yes only the exhaust as the intake valves are not plunged into the 
combustion chamber when the gases are burnt. The intake valves go down when 
there is a fresh 'cool' intake air in the chamber. It's also on the KH 
engine which is also trubo. Better stick w/ the sodium valves for exhaust. 
For intake, the stock ones are fine, and are much cheaper [no sodium].

At 07:39 PM 9/26/00, you wrote:
>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
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