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RE: Advice on cylinder head

To: Hugh Fader <hfader@usa.net>
Subject: RE: Advice on cylinder head
From: "Robert M. Lang" <lang@isis.mit.edu>
Date: Wed, 6 Feb 2002 11:15:38 -0500 (EST)
On Tue, 5 Feb 2002, Hugh Fader wrote:

> Thanks everyone for the well thought out advice. Based on everyone's input,
> I am going to postpone anything beyond the head work for a couple of years.
> I am still pondering CR increase and valve seat inserts.
> 
> One final question: I recall reading that the bronze inserts need some
> special treatment or else the valves may stick. Any advice on this?

The proper installtion of the valve guides is that youfit them in and then
ream them to a proper clearance for the material. I'm not a machinist, so
I don't know the numbers, but it's a safe bet that the thermal coefficient
of expansion for bronze valve guides is different than the stock cast iron
pieces. Therefore, you probably need to make them a bit looser, i.e.
slightly larger ID than the stock setup. 
 
> Thanks again,
> Hugh

regards,
rml
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