<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Does anyone have anything to add about the information I provided about a what looks like a 5th casting for 4 cylinder TRs? I hope the message came through with the attached photos.</div><div id="AppleMailSignature">Dave H.<br><br>Sent from my iPad</div><div><br>On Nov 26, 2018, at 4:25 PM, Dave <<a href="mailto:dlhogye@comcast.net">dlhogye@comcast.net</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>The differences in the TR2-4 cylinder heads are well documented, including TeriAnn's. Yes, there are at least two and possibly TR3 high port castings. Early ones have the rounded thermostat casting and later ones have the angled one. However, I have two heads that I have not found information. These heads are like the TR4A head casting in that they have the flat between the front stud holes, but are other wise similar to the later TR3 casting. They are stamped 510084 on the flat. TR4As are stamped 511695. They might be TR4. They have the two different valve stem sized guides, the step down in diameter of the intake port, like high port TR3s and they have the angled t-stat casting. </div><div id="AppleMailSignature">Can anyone share some info on these. </div><div id="AppleMailSignature">Dave H.</div><div id="AppleMailSignature"><image1.JPG><image2.JPG><br><br>Sent from my iPad</div><div><br>On Nov 26, 2018, at 11:14 AM, Andrew Uprichard <<a href="mailto:auprichard@uprichard.net">auprichard@uprichard.net</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Times New Roman","serif";
color:windowtext;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">When it comes to the 4-cylinder TR models, I am aware of four variations on cylinder head design: the original low-port TR2 head, the “le Mans” head which was a variation on the low port design, the high port head which came with most of the TR3s and the TR4 head with the smaller intake aperture.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">But someone was talking to me the other day about a variation in the high port TR3 head. According to this guy, there was a variation in the thermostat housing, some of which were more sloping than rounded. He claimed the sloped design was more attractive as it lended itself to more shaving and thus a better, high compression engine.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">I must admit I had never heard about this. I have three heads sitting in my barns and all have what appears to be the same, rounded underneath to the thermostat housing.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">Has anyone heard of this?<br><br>Andrew Uprichard<o:p></o:p></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">Jackson, Michigan<o:p></o:p></span></p></div></div></blockquote><blockquote type="cite"><div><span>** <a href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **</span><br><span></span><br><span>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a></span><br><span>Archive: <a href="http://www.team.net/pipermail/triumphs">http://www.team.net/pipermail/triumphs</a> <a href="http://www.team.net/archive">http://www.team.net/archive</a></span><br><span></span><br><span>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net">http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net</a></span><br></div></blockquote></div></blockquote><blockquote type="cite"><div><span>** <a href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **</span><br><span></span><br><span>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a></span><br><span>Archive: <a href="http://www.team.net/pipermail/triumphs">http://www.team.net/pipermail/triumphs</a> <a href="http://www.team.net/archive">http://www.team.net/archive</a></span><br><span></span><br><span>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net">http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net</a></span><br></div></blockquote></body></html>