[Healeys] 100 alloy head

[Kees Oudesluijs]

If used with water instead of proper coolant electrolytic corrosion will 
be most likely between the aluminium and copper which are chemically far 
apart. A NOS steel/asbestos/steel  head gasket will be better as there 
will be far less electrolytic corrosion. Better still to use a modern 
composite head gasket if available, but check the torquing procedure as 
that may be very different compared to the old fashioned way. Sometimes 
new studs and nuts are required.

As mentioned by Alan regular re-torquing an aluminium head on a cast 
iron block is sometimes necessary as the aluminium of the head expands 
quite a bit more than cast iron/steel when hot thus exposing the copper 
head gasket to a varying compression all the time which will harden and 
flatten the copper.  A steel/asbestos or composite head gasket  may be 
less sensitive to this.

Make sure you use thick machined and hardened steel washers under the 
head nuts to prevent damage to the head.

If the copper gasket has no visible damage you may possibly reuse it 
after annealing, heating it evenly to cherry red and letting it cool down.


Kees Oudesluijs



Op 3-9-2019 om 08:36 schreef Alan Seigrist:
> The Ali head probably needs to be retorqued a little more often than a 
> steel head.... 10 years is a while, probably why the gasket blew.
>
> On Tue, Sep 3, 2019 at 4:07 AM Lou G <lgalper1 at cox.net 
> <mailto:lgalper1 at cox.net>> wrote:
>
>     I’ve been using the DW head for about 10 years. No problems till
>     last week when white smoke came out on startup.  No white smoke
>     since then, but maybe Roland will come over to pull head.  !
>     Using the stock copper head gasket the whole time.
>     Now AH Spares advertises a newly engineered head for those looking.
>     Thankfully we have some choices.
>
>     Lou
>     AHC San Diego
>
>
>
>     Subject: Re: [Healeys] 100 alloy head
>
>     I bought a Denis Welsh head. It is a simple bolt on but you are
>     going to add  their studs and nuts and a steel cylinder head
>     gasket - at least that is what I did. Go to the web site and read
>     all that applies to cylinder heads. You can buy a bare head or one
>     that has been prepped for street or competition. It is cheaper to
>     buy from the UK than from the US resellers.  I only have 70 miles
>     on my BN1 but so far so good.
>
>     -Roland
>     BN1 #724
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