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Re: [Fot] . Head intake / exhaust port question

To: "'Dan'" <>, "'FOT List Triumph'" <>
Subject: Re: [Fot] . Head intake / exhaust port question
From: "Steve Yott" <>
Date: Fri, 19 Dec 2014 13:36:49 -0600
References: <>
Thread-index: AdAbwK+/37bMCJ0tR7af8+n5I5L27wAAYbfw
My opinion only but, I would never use an epoxy in the exhaust port as the
temps are way too high and the epoxy will turn to liquid!  This works fine
in an intake port (but not the pocket) that is relatively cool.  On the
exhaust the transition from the pocket to the runner is really bad on flow
as it is nearly a right angle.  What I do is grind down the valve guide boss
in order to smooth the transition.  I have taken as much as 3/32" from the
boss and then rounded the transition as much as possible.  It is a middle of
the road fix but much better than stock and far cheaper than welding.

Steve Yott

-----Original Message-----
From: Fot [] On Behalf Of Dan
Sent: Friday, December 19, 2014 1:19 PM
To: FOT List Triumph
Subject: [Fot] . Head intake / exhaust port question

I have posted to a couple of TR related sites and have received conflicting
info to this inquiry:

In one of Kas Kastner's recent books he shows a couple of cross sections
the intake and exhaust ports.  On the exhaust he shows a weld build up
location behind the valve guide that then gets ground down to smooth the
transition of the outgoing gas.  Wondering if anyone has tried to use MOROSO
+ B Epoxy in place of the weld and if so what has been the result?  TR
in a reply indicated that as long as the exhaust gas didn't exceed 250
it should work.  So next question is what is the normal exhaust gas temp on
might see in the pocket just below the exhaust valve?



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