Is it less work to ream the existing iron guides then to press in
bronze sleeves compared to pressing out the iron guides and pressing in
the bronze guides? I have only done replacements of guides with
guides; never tried ( or heard before ) of using guide sleeves.
Replacing guides with guides is easy--just press them out, press new in,
then ream to ensure the fit. Knurling guides is an inexpensive way to
reduce ID of a guide, and it's said to make iron guides retain an oil
film better, but I cannot recall anyone mentioning it lately.
Generally, one uses bronze guides to move heat from the valves to the
head faster than it flows through iron guides. In a standard-spec engine
does it matter? MG didn't think so, as they used iron guides in the MGB
and MGC engines.
How about pressing out the worn iron guides and pressing in new iron
guides if cost is a concern?
What is the difference in cost between bronze guides and guide inserts?
Bob
On Tue, 18 Mar 2008 06:28:05 +0000 cyberemp@comcast.net writes:
> Greetings 0 list.
> Head for 74.5 needs guides. Machinist is offering to put bronze
> sleeves into
> existing cast iron guides,(after reaming current guides, of course)
> but I'm
> curious to know if anyone has any experience with this technique.
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