[Healeys] 100-4 engine head gasket?

[David P]

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> on behalf of Alan 
> Seigrist <healey.nut at gmail.com>
> *Sent:* Tuesday, January 26, 2021 2:54 AM
> *To:* Michael Oritt <michael.oritt at gmail.com>
> *Cc:* Healey list <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 <mailto: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 <mailto: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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