[Fot] Re-valve guides revisited

[Randall]

> about the only OE manufacturer that I've seen that routinely 
> uses a bronze
> guide is M Benz, and they are a very special product and only 
> used in some
> of their engines

FWIW (not much) I recall reading that GM used bronze alloy guides in their
supercharged Corvair; due to unacceptable wear with cast-iron guides.  But
the same engine naturally aspirated used cast iron.

-- Randall