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<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<br>
</p>
<div class="moz-cite-prefix">On 1/26/2021 11:09 AM, WILLIAM B
LAWRENCE wrote:<br>
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<div>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.</div>
<div><br>
</div>
<div>Bill Lawrence</div>
<div>BN1 #554</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
Healeys <a class="moz-txt-link-rfc2396E" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> on behalf of
Alan Seigrist <a class="moz-txt-link-rfc2396E" href="mailto:healey.nut@gmail.com"><healey.nut@gmail.com></a><br>
<b>Sent:</b> Tuesday, January 26, 2021 2:54 AM<br>
<b>To:</b> Michael Oritt <a class="moz-txt-link-rfc2396E" href="mailto:michael.oritt@gmail.com"><michael.oritt@gmail.com></a><br>
<b>Cc:</b> Healey list <a class="moz-txt-link-rfc2396E" href="mailto:Healeys@autox.team.net"><Healeys@autox.team.net></a><br>
<b>Subject:</b> Re: [Healeys] 100-4 engine head gasket?</font>
<div> </div>
</div>
<div>
<div dir="ltr">Hi Michael -
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Alan<br>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Mon, Jan 25, 2021 at
10:27 PM Michael Oritt <<a
href="mailto:michael.oritt@gmail.com"
moz-do-not-send="true">michael.oritt@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px
0.8ex; border-left:1px solid rgb(204,204,204);
padding-left:1ex">
<div dir="ltr">
<div class="x_gmail_default" style="color:rgb(51,51,255)">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. </div>
<div class="x_gmail_default" style="color:rgb(51,51,255)"><br>
</div>
<div class="x_gmail_default" style="color:rgb(51,51,255)">Best--Michael
Oritt</div>
</div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Mon, Jan 25, 2021
at 4:55 AM Alan Seigrist <<a
href="mailto:healey.nut@gmail.com" target="_blank"
moz-do-not-send="true">healey.nut@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px
0px 0.8ex; border-left:1px solid rgb(204,204,204);
padding-left:1ex">
<div dir="ltr">All -
<div><br>
</div>
<div>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):<br>
<br>
1 - 135 psi<br>
2 - 135 psi</div>
<div>3 - 60 psi</div>
<div>4 - 60 psi</div>
<div><br>
</div>
<div>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.<br>
<br>
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?</div>
<div><br>
</div>
<div>TIA<br>
<br>
Alan</div>
</div>
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