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I have the TR-3/4, and 1300 Spit heads sectioned, but not the 6 cylinder or
late Spit, which are different, so I'm no help here, but I will say though that
it's just a rough casting, and the squish area "flat" is where it will first go
through. This is likely where Scotts machinist is seeing it start to "sink" in
a bit.
Glen
-----Original Message-----
From: SCOTT JANZEN via Fot <fot@autox.team.net>
To: damys <damys@charter.net>; 'Friends of Triumph' Triumph <fot@autox.team.net>
Sent: Mon, Apr 6, 2015 8:47 am
Subject: Re: [Fot] Head Thickness
I will measure two of mine when I get home . There's no single answer as every
casting is different. I've got one at 12:1 compression with no thin spots and
another at 11.5:1 where you can clearly see a thin spot where the metal is
deforming near a cooling passage. The machinist did several light passes,
looking for this.
There was an email just over a week ago with photos of a head marked with the
thin spots. Look for that for guidance and find a good machinist that will take
a little off at a time, looking for trouble.
Sent from my mobile device
On Apr 6, 2015, at 7:27 AM, damys--- via Fot < fot@autox.team.net> wrote:
Wondering if anyone can tell me the max I can shave off my GT6 head.
Actually looking for the minimum height of the head after milling. Right now
the head stands at 3.283". With a 2.95 bore, 2.99 stroke, .033 squished head
gasket and 34.5 cc valve pockets. The compression, as I figure it, is 9.76:1.
I'm looking for 12:1.
The head is stamped V3119 and 308361. It's off of a 1970 GT6+ that we're
building strictly for racing. Looks like we can still remove at least .040.
Any help will be greatly appreciated.
Dave
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<font color='black' size='2' face='Arial, Helvetica, sans-serif'>I<font
size="2"> have the TR-3/4, and 1300 Spit heads sectioned, but not the 6
cylinder or late Spit, which are different, so I'm no help here, but I will say
though that it's just a rough casting, and the squish area "flat" is where it
will first go through. This is likely where Scotts machinist is seeing it start
to "sink" in a bit.<br>
Glen<br>
</font>
<div> <br>
</div>
<div> <br>
</div>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: SCOTT JANZEN via Fot <fot@autox.team.net><br>
To: damys <damys@charter.net>; 'Friends of Triumph' Triumph
<fot@autox.team.net><br>
Sent: Mon, Apr 6, 2015 8:47 am<br>
Subject: Re: [Fot] Head Thickness<br>
<br>
<div id="AOLMsgPart_1.2_220ded73-89fc-4d26-867c-f3f41c943586">
<div dir="auto" class="aolReplacedBody">
<div>
I will measure two of mine when I get home . There's no single answer as every
casting is different. I've got one at 12:1 compression with no thin spots and
another at 11.5:1 where you can clearly see a thin spot where the metal is
deforming near a cooling passage. The machinist did several light passes,
looking for this.
</div>
<div>
There was an email just over a week ago with photos of a head marked with the
thin spots. Look for that for guidance and find a good machinist that will take
a little off at a time, looking for trouble.
<br>
<br>
Sent from my mobile device
</div>
<div>
<br>
On Apr 6, 2015, at 7:27 AM, damys--- via Fot <
<a target="_blank"
href="mailto:fot@autox.team.net";>fot@autox.team.net</a>> wrote:
<br>
<br>
</div>
<blockquote>
<div>
<div align="LEFT">
<font color="#000000" face="Verdana" size="2">Wondering if anyone can tell
me the max I can shave off my GT6 head. Actually looking for the minimum height
of the head after milling. Right now the head stands at 3.283".
With a 2.95 bore, 2.99 stroke, .033 squished head gasket and 34.5 cc valve
pockets. The compression, as I figure it, is 9.76:1. I'm looking
for 12:1.</font>
</div>
<div align="LEFT">
<font color="#000000" face="Verdana" size="2">The head is stamped V3119 and
308361. It's off of a 1970 GT6+ that we're building strictly for
racing. Looks like we can still remove at least .040.</font>
</div>
<div align="LEFT">
<font color="#000000" face="Verdana" size="2">Any help will be greatly
appreciated.</font>
</div>
<font color="#000000" face="Verdana" size="2"><br>
</font>
<div align="LEFT">
<font color="#000000" face="Verdana" size="2">Dave</font>
</div>
</div>
</blockquote>
<blockquote>
<div>
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</div>
</blockquote>
</div>
</div>
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<pre style="font-size: 9pt;"><tt>_______________________________________________
<a href="mailto:fot@autox.team.net";>fot@autox.team.net</a>
<a href="http://www.fot-racing.com";
target="_blank">http://www.fot-racing.com</a>
Donate:
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target="_blank">http://www.team.net/donate.html</a>
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target="_blank">http://www.team.net/archive</a>
Forums:
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target="_blank">http://www.team.net/forums</a>
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target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a>
</tt></pre>
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_______________________________________________
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