<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body dir="auto"><div dir="auto">I have never had to go that far. The problem would be not the combustion chamber but the flat surface would be way too thin and collapse in short order. You would be much better off with popping the piston or go with a slight done to get that level of compression.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="composer_signature" dir="auto"><div style="font-size:12px;color:#575757" dir="auto">Sent via the Samsung Galaxy S23+ 5G, an AT&T 5G smartphone</div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: GREGORY THOMPSON via Fot <fot@autox.team.net> </div><div>Date: 4/5/24 6:36 PM (GMT-06:00) </div><div>To: FOT Triumph <fot@autox.team.net> </div><div>Subject: [Fot] TR4 head milling </div><div><br></div></div>Has anyone had an issue with breaking into a water jacket on the TR4A head with taking off .150?<div><br></div><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class="ydp72b54109yahoo-style-wrap"><div><div>Thank you,</div><div><br></div><div class="ydp72b54109signature">Greg Thompson </div></div></div></div></body></html>