[Healeys] 100-4 engine head gasket?

[Alan Seigrist]

Hi David -

This is very interesting.  Let me see what it looks like when I get the
head off, and I might ask for your guy's contacts if that's what I
determine is the problem.

Best,

Alan

On Wed, Jan 27, 2021 at 2:27 AM David P <frogeye at porterscustom.com> wrote:

> I solved this by having a gasket maker in Lubbock make individual 0.0025
> rings to provide a little more squish around each bore.  Dave
> On 1/26/2021 11:09 AM, WILLIAM B LAWRENCE wrote:
>
> If you are going to use a steel or MLS gasket you are going to have to
> resurface the block and head. They need a finer finish than copper.
>
> Bill Lawrence
> BN1 #554
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net>
> <healeys-bounces at autox.team.net> on behalf of Alan Seigrist
> <healey.nut at gmail.com> <healey.nut at gmail.com>
> *Sent:* Tuesday, January 26, 2021 2:54 AM
> *To:* Michael Oritt <michael.oritt at gmail.com> <michael.oritt at gmail.com>
> *Cc:* Healey list <Healeys at autox.team.net> <Healeys at autox.team.net>
> *Subject:* Re: [Healeys] 100-4 engine head gasket?
>
> Hi Michael -
>
> Sounds to me the smart thing to do is put in a steel head gasket because
> the head was rebuilt not that many miles ago, so I might have a low spot
> there.  The head is torqued correctly so that's not it.
>
> Best,
>
> Alan
>
>
>
> On Mon, Jan 25, 2021 at 10:27 PM Michael Oritt <michael.oritt at gmail.com>
> wrote:
>
> Probably blown gasket at the 3-4 bridge.  My original head suffered from
> erosion of the metal at the 1-2 bridge, allowing the gasket to blow.  I had
> it built up enough to work for a while but eventually replaced the head
> with a DWR AL model.
>
> Best--Michael Oritt
>
> On Mon, Jan 25, 2021 at 4:55 AM Alan Seigrist <healey.nut at gmail.com>
> wrote:
>
> All -
>
> My A90 just started running weird.  So I took a compression tester and I'm
> getting (note the A90 is lower compression than the 100):
>
> 1 - 135 psi
> 2 - 135 psi
> 3 - 60 psi
> 4 - 60 psi
>
> When I put the compression tester on number 3, I get blow back through #4
> spark plug port.  Then when I put it on #4 I get blow back through the #3
> spark plug port.
>
> Seems to me it's just a blown head gasket.... am I correct?  as far as I'm
> aware, these heads usually crack between 2 & 3, correct?
>
> TIA
>
> Alan
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