<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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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 have a bit of machining experience and I would not attempt this on my own. I’m guessing that the oil pan flange and the head are parallel; they certainly should be. A machinist can take the block and set it on a mill or drill press table which should be perpendicular to the drill axis and drill the hole oversize to accept the insert of your choice. But as another said have the block checked to be certain the current hole is not cracked. Fix it correctly and don’t look back. </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Another method might be to use a magnetic drill base set up on the block surface making certain the drill is perpendicular to the block face. Positioning the drill correctly will take some skill that a good machinist would have.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>JVV </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:dconnitt@fuse.net">Dave Connitt</a><br><b>Sent: </b>Monday, December 13, 2021 6:22 PM<br><b>To: </b><a href="mailto:guy.huggins@icloud.com">Guy Huggins</a><br><b>Cc: </b><a href="mailto:triumphs@autox.team.net">Triumph Mailing List</a><br><b>Subject: </b>Re: [TR] 1965 TR4A - Looking to drill out a stud hole in block. Need recommendations on a drill guide/jig.</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello Guy,<o:p></o:p></p><div><p class=MsoNormal>That is a tough one. Have you considered talking this over with the machinist that did your cylinder head as he may have come across this type of issue before. I agree with you that locating and holding the X, Y and Z positions of the repair is critical. <o:p></o:p></p></div><div><p class=MsoNormal>Best of luck to you.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Dave Connitt <o:p></o:p></p><div><p class=MsoNormal>Sent from my iPhone<o:p></o:p></p></div><div><p class=MsoNormal><br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal style='margin-bottom:12.0pt'>On Dec 11, 2021, at 6:35 PM, Guy Huggins <guy.huggins@icloud.com> wrote:<o:p></o:p></p></blockquote></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>Howdy All,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>As part the head gasket replacement project, I need to address a wallowed-out and stripped cylinder head stud hole in the block.<o:p></o:p></p></div><div><p class=MsoNormal>(If you were standing on the manifold side of the engine, it would be the one furtherest to the front, on the manifold side.)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>A stud goes in straight up and down until the top of the threads are even with the block, but it wiggles like hell.<o:p></o:p></p></div><div><p class=MsoNormal>As you tighten the stud down further, the wiggle starts to go away, but the whole thing starts to cant back toward the rear of the block.<o:p></o:p></p></div><div><p class=MsoNormal>This make it impossible to slide the head down over the canted stud.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>To fix this I intend to install a coiled insert. (drill just 1/32” oversized, tap, install insert).<o:p></o:p></p></div><div><p class=MsoNormal>I am hoping that someone from the list knows of a drilling jig/guide for the drilling phase.<o:p></o:p></p></div><div><p class=MsoNormal>I know better than to attempt drilling out cast iron without a steadying device of some sort.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Any and all tips and advice are welcome.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The hole is 1 5/16” deep, and the threads of the stud measure 3/4”.<o:p></o:p></p></div><div><p class=MsoNormal>It is basically threaded top to bottom.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks in advance.<o:p></o:p></p></div><div><p class=MsoNormal>I hate it when you have to fix the unknown thing to fix the known thing.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><div><div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Helvetica",sans-serif;color:black'>Kind Regards,<br><br>Guy D. Huggins<br><a href="mailto:guy.huggins@icloud.com">guy.huggins@icloud.com</a><br>817.454.6415<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></blockquote></div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:.5in;margin-bottom:5.0pt;margin-left:.5in'>** triumphs@autox.team.net **<br><br>Donate: http://www.team.net/donate.html<br>Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive<br><br>Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/dconnitt@fuse.net<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>