[Healeys] Valve guides

[Oudesluys]

The best/safest material for valve guides in a cast iron head is cast 
iron. It has the same expansion coefficient as the cast iron of the head 
so they can not detach themselves from the head. As the valves are iron 
too (steel) the tolerance between valves and guides can be slightly 
tighter. Bronze guides are better suited to aluminium heads as the 
difference in expansion is less.
Bronze guides are used because of their better lubrication and thus 
presumably lesser wear between valves and guides.
As the mileages we put up in these old cars are usually limited, wear is 
not an issue. It does not make much sense to deviate from the original.
Kees Oudesluijs
NL


Op 19-10-2011 1:12, john spaur schreef:
> I checked the archives and there was a post saying not to use bronze 
> valve guides in a cast iron head. My engine is basically stock.
>
> I noticed two there are two different valve guides; one is cast iron 
> (stock I presume) and the other is manganese-bronze.
>
> What material should I use for the valve guides.
>
> What is a good source to purchase them from?
>
> Thank you,
> John Spaur
> '62 BT7
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