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<div dir="ltr" data-setdir="false">Yes, a slight piston dome, I use around 6cc, eliminates the need to cut the head so much, & doesn't interfere w/flame travel/combustion.</div><div dir="ltr" data-setdir="false">When you get down to around 3.150 thick, things get iffy...<br></div><div dir="ltr" data-setdir="false">Also when establishing CR, book recommendations are just that, general starting points; valve head type & seat depth affect chamber volume, so it's best to cut the head after all else has been established.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Glen Efinger<br></div><div><br></div>
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On Sunday, April 7, 2024 at 02:36:01 AM EDT, tr4 via Fot <fot@autox.team.net> wrote:
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<div><div id="ydpac5ed56fyiv9068450430"><div><div>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><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="ydpac5ed56fyiv9068450430composer_signature"><div style="font-size:12px;color:#575757;">Sent via the Samsung Galaxy S23+ 5G, an AT&T 5G smartphone</div></div><div><br clear="none"></div><div><br clear="none"></div><div style="font-size:100%;color:#000000;" align="left"><div id="ydpac5ed56fyiv9068450430yqtfd17335" class="ydpac5ed56fyiv9068450430yqt3931664433"><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 clear="none"></div></div></div><div id="ydpac5ed56fyiv9068450430yqtfd96139" class="ydpac5ed56fyiv9068450430yqt3931664433">Has anyone had an issue with breaking into a water jacket on the TR4A head with taking off .150?<div><br clear="none"></div><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class="ydpac5ed56fyiv9068450430ydp72b54109yahoo-style-wrap"><div><div>Thank you,</div><div><br clear="none"></div><div class="ydpac5ed56fyiv9068450430ydp72b54109signature">Greg Thompson </div></div></div></div></div></div></div><div class="ydpac5ed56fyqt3931664433" id="ydpac5ed56fyqtfd78316">_______________________________________________<br clear="none"><a shape="rect" href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a><br clear="none"><br clear="none"><a shape="rect" href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br clear="none"><br clear="none">Donate: <a shape="rect" href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br clear="none">Archive: <a shape="rect" href="http://autox.team.net/archive" rel="nofollow" target="_blank">http://autox.team.net/archive</a> <a shape="rect" href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br clear="none">Unsubscribe/Manage: <a shape="rect" href="http://autox.team.net/mailman/options/fot/fubog1@aol.com" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a><br clear="none"><br clear="none"><br clear="none"></div></div>
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