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--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>I would agree with Tony. Given that you never know if the casting of your head is thin at some location it is better to start on the conservative side. Better to leave a little power for next time than ruin a head you have lots of work in. I say this because there is far more power in the valves and porting than a .010 cut off the head for more compression. Ken</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:fot@autox.team.net">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">GREGORY THOMPSON</a>; <a href="mailto:fot@autox.team.net">FOT Triumph</a><br><b>Subject: </b>Re: [Fot] TR4 head milling</p></div><p class=MsoNormal><o:p> </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><p>Regards, Tony</p><div><p class=MsoNormal>On 4/5/2024 6:27 AM, GREGORY THOMPSON via Fot wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Has anyone had an issue with breaking into a water jacket on the TR4A head with taking off .150? <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Helvetica",sans-serif'>Thank you,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Helvetica",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Helvetica",sans-serif'>Greg Thompson <o:p></o:p></span></p></div></div></div></div><p class=MsoNormal><br><br><o:p></o:p></p><pre>_______________________________________________</pre><pre><a href="mailto:fot@autox.team.net">fot@autox.team.net</a></pre><pre><o:p> </o:p></pre><pre><a href="http://www.fot-racing.com">http://www.fot-racing.com</a></pre><pre><o:p> </o:p></pre><pre>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a></pre><pre>Archive: <a href="http://autox.team.net/archive">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot">http://www.team.net/pipermail/fot</a></pre><pre>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/tony@tonydrews.com">http://autox.team.net/mailman/options/fot/tony@tonydrews.com</a></pre><pre><o:p> </o:p></pre></blockquote><pre style='mso-margin-top-alt:0in;margin-right:.5in;margin-bottom:5.0pt;margin-left:.5in'><o:p> </o:p></pre><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p></div></body></html>