<HTML><HEAD></HEAD>
<BODY dir=ltr>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial'; COLOR: #000000">
<DIV>I’m interested in the responses too as I recently suffered a head gasket
failure around the intake shroud of #4 using a 91 mm Cometic (very similar to
the Lucas new improved one) In my case the head is milled .090 using 87 mm
liners. The old Payen style lasted 30 or more years until I did a valve job 4
years ago. The Cometic lasted 4 years until it failed. I’ve discovered some
extenuating circumstances which may have caused my failure but I am interested
in the responses, especially from those who have moved up to the 89 mm liners.
How have you sealed the 89’s and or is it too early to report results? Also
please indicate if you’ve milled the head and by how much.</DIV>
<DIV> </DIV>
<DIV>I’ve discussed this with some very reputable Triumph performance folks in
the last week and gotten some good input but would like to broaden the
discussion. Once we see some responses I’ll be pleased to share what I’ve
discovered. Those who I’ve already discussed this with can chime in or not, I
will include your advice but not who you are unless I have your permission. But
I’d like to hear some input from others before I do that.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV> </DIV>
<DIV>Jerry Van Vlack aka JVV</DIV>
<DIV>66 TR4A</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV style="FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=asg123@centurylink.net>asg123@centurylink.net</A> </DIV>
<DIV><B>Sent:</B> Wednesday, September 20, 2017 1:51 PM</DIV>
<DIV><B>To:</B> <A title=triumphs@autox.team.net>triumphs@autox.team.net</A>
</DIV>
<DIV><B>Subject:</B> [TR] TR4A head gasket, 87 mm cylinders</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: arial, helvetica, sans-serif; COLOR: #000000">
<DIV>I have asked a similar question before but my mechanic and I are still
undecided which rabbit hole to enter<BR></DIV>
<DIV>Does anyone have experience with which head gaskets hold up best against
blowing out around the combustion chambers? I see the stainless steel
composite gaskets which claim to be the best. But, some people, including
the tech support at BPNW, say that the OE copper gasket by Payen withstands high
compression the best. How does the German made Payen copper gasket hold up
compared to the Lucas OE type copper gasket? We had an OE copper
head gasket blow out between cylinders #1 and #2 after only a few thousand
miles. It was using 93 octane gas with the timing retarded a couple degrees to
keep down spark knock, but it still dieseled on when we tried to shut it
off. A solid copper head gasket from Gasket Works custom milled to
drop the compression to 130psi fixed the spark knock and dieseling, but we had
chronic problems with the oil and water weeping into each other no matter what
sealants we tried. As always thanks for your responses. Arnold
<BR></DIV></DIV>
<P>
<HR>
<BR></DIV></DIV></DIV></BODY></HTML>