<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>
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<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>
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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.
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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.
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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:
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<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>
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<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>
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<font color="#000000" face="Verdana" size="2">Any help will be greatly appreciated.</font>
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<font color="#000000" face="Verdana" size="2">Dave</font>
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