[Healeys] Valve guides
Bob Spidell
bspidell at comcast.net
Wed Oct 19 06:32:01 MDT 2011
FWIW, I've got bronze guides in my (iron) BJ8 head. No problems for 80K miles.
Bob
On 10/18/2011 11:17 PM, Oudesluys wrote:
> 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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Bob Spidell San Jose, CA bspidell at comcast.net
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