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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Andrew,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>TeriAnn’s web site give the differences between the head designs, this should help answer your question:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="http://www.tr3a.info/FAQ_heads.htm">http://www.tr3a.info/FAQ_heads.htm</a><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Bill B<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>TS30800L<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Triumphs [mailto:triumphs-bounces@autox.team.net] <b>On Behalf Of </b>Andrew Uprichard<br><b>Sent:</b> Monday, November 26, 2018 1:15 PM<br><b>To:</b> triumphs@autox.team.net<br><b>Subject:</b> [TR] TR cylinder heads<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><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></body></html>