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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>If the block is cracking from head stud to water jacket, it is normally caused by tightening the head studs in the block.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>To avoid cracks, run the studs in by hand, without any tool. That is enough.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Tighten them will split the block.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>The torque of the head nuts are at the limit of what the block can take, that’s why the split in the thread hole zone when the studs are wrenched in.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Cheers<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Chris<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b>Von:</b> Fot <fot-bounces@autox.team.net> <b>Im Auftrag von </b>fubog1 via Fot<br><b>Gesendet:</b> Dienstag, 14. Januar 2020 22:00<br><b>An:</b> fot@autox.team.net<br><b>Betreff:</b> Re: [Fot] Main brg strap<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><div id=yiv9217778070><div><div><blockquote style='margin-left:6.75pt;margin-right:0cm'><div id=yiv9217778070><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>That crack is pretty common with these, a Timesert or similar is the correct repair.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Re the center main cap strap, in my experience, these are engines are good up to 6.5kish, if it has a good crank & all is within spec and well balanced, and the loads are within reasonable limits.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Beyond that the bending loads increase with RPM, due to the recip weight heavily loading that center main, and it gets overloaded.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Once the cap deforms and/or fastener stretches, ie it's not round anymore and not supporting the bearings, the bad stuff starts to happen.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>You can tell if it getting overloaded, measure the center journal very carefully, we're into tenths now, and note where the wear is, it's normally even all around the journal.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>When the load gets too heavy the wear will be mostly on the crankpin side of the journal; it will be very obvious.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>At that point a center strap will help for sure but the loads will still be there unless weight is reduced.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>This is why I try to focus on torque vs high RPM HP with these engines.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Glen<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p><div><div id=yiv9217778070yqtfd74137><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>> wrote:<o:p></o:p></span></p></div></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div id=yiv9217778070yqtfd38436><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Well it’s finally time to build a new motor... the crack at the rear head bolt just won’t stop leakin anymore...so...<br>I’ve found the Chevy front strap to use on the center main, but what are you using for main bolts/studs for the additional length?<br>How about a complete set of fasteners for the mains? Does ARP make anything?<br><br>Motoring on in NORCAL<br>Nick<br><br>Sent from the wilds of NorCal <br>_______________________________________________<br><a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fotUnsubscribe/Manage" target="_blank">http://www.team.net/pipermail/fot<br>Unsubscribe/Manage</a><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>: <a href="http://autox.team.net/mailman/options/fot/rkramer56@gmail.com" target="_blank">http://autox.team.net/mailman/options/fot/rkramer56@gmail.com</a> <o:p></o:p></span></p><div id=yiv9217778070yqtfd54929><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><br><br><o:p></o:p></span></p></div></blockquote></div></div></div><div id=yiv9217778070yqtfd12585><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>_______________________________________________<br><a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive </a><a href="http://www.team.net/pipermail/fot" target="_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/gasket.works@gte.net" target="_blank">http://autox.team.net/mailman/options/fot/gasket.works@gte.net</a><br><br><o:p></o:p></span></p></div></blockquote></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>_______________________________________________<br><a href="mailto:fot@autox.team.net">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive </a><a href="http://www.team.net/pipermail/fot" target="_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/fubog1@aol.com" target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a><br><br><o:p></o:p></span></p></div></div></div></body></html>