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Just a comment or two from my archives:
According to Ken Gillanders, the stock head measures between 3.325 and
3.330 from the valve cover gasket surface to the head gasket surface. So
be sure to check the head height in case they head had previously been
shaved. When the head casting was changed to include a diagonal flat
section on the underside of the lower thermostat housing the thickness
of metal between the bottom of the head and the internal water passages
was increased. So I suggest not shaving the earlier heads with rounded
lower thermostat housing beyond surfacing shaves.
> *Sent: *Saturday, April 6, 2024 1:50 PM
> *Subject: *Re: [Fot] TR4 head milling
>
> Working with my dad (uncle jack) we considered 0.130 to 0.150 "normal"
> to mill, 0.190 to be where it started to get dangerous. That said,
> there is some variability from head to head on where the internal
> water passages are.
>
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<p>Just a comment or two from my archives:</p>
<p>According to Ken Gillanders, the stock head measures between
3.325 and 3.330 from the valve cover gasket surface to the head
gasket surface. So be sure to check the head height in case they
head had previously been shaved. When the head casting was changed
to include a diagonal flat section on the underside of the lower
thermostat housing the thickness of metal between the bottom of
the head and the internal water passages was increased. So I
suggest not shaving the earlier heads with rounded lower
thermostat housing beyond surfacing shaves.<br>
</p>
<blockquote type="cite"
cite="mid:6611cd42.170a0220.1f0e0.0be9SMTPIN_ADDED_BROKEN@mx.google.com">
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style="mso-element:para-border-div;border:none;border-top:solid #E1E1E1
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<p class="MsoNormal" style="border:none;padding:0in"><b>From:
</b><a href="mailto:fot@autox.team.net";
moz-do-not-send="true">Tony Drews via Fot</a><br>
<b>Sent: </b>Saturday, April 6, 2024 1:50 PM<br>
<b>To: </b><a href="mailto:thompsong@prodigy.net";
moz-do-not-send="true">GREGORY THOMPSON</a>; <a
href="mailto:fot@autox.team.net"; moz-do-not-send="true">FOT
Triumph</a><br>
<b>Subject: </b>Re: [Fot] TR4 head milling</p>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p>Working with my dad (uncle jack) we considered 0.130 to 0.150
"normal" to mill, 0.190 to be where it started to get
dangerous. That said, there is some variability from head to
head on where the internal water passages are.</p>
</div>
</blockquote>
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