> a Wallace wrote:
>
> > This is probably a good time to get stellite faced exhaust
> valves, with the
> > narrower stems as found on TR4s. You will need different guides
> of course
> > to accommodate them; there are silicon-bronze or something similar
> > available now that are supposed to be superior to cast iron -
> Randall has
> > suggested sources.
>
> Make that "as found on later TR4's" since wide shoulder valves as found on
> TR3's were carried over for early TR4's as well (at least till CT5018LO).
It's perhaps worth clarifying that you can't simply use exhaust guides from
the later TR4/4A, the holes that the guides fit into are larger in the
earlier heads.
However, the conversion guides (for fitting 5/16" valves to 3/8" heads) are
available both in phosphor (or is it manganese) bronze, and in cast iron.
Opinion seems to be somewhat divided whether the bronze guides are actually
better on the street, they do have to be reamed after installation and to a
larger diameter than the cast iron ones (which usually don't have to be
reamed).
Randall
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