RE: N/A v. Turbo heads...

["Horch, August" <Horch.August@tci.com>]

> > Are there any differences in the basic cylinder head castings used
> on
	> the N/A and turbo I5s?

> I believe the castings may be the same, but turbos have sodium filled
> valves, while N/A motors do not.
> 
Ken, you're right, there was a big debate on the list a while ago on how
to dispose of the sodium filled jobs in a enviromentally responsible
type of way.  Does anyone know why or what the advantage of sodium
filled valves is?

-August