<div dir="ltr">Ken Gilanders and others advised us to chamfer those stud holes to prevent raised edges as well.<div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Bob Kramer</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 14, 2020 at 3:00 PM fubog1 via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div><font size="2">That crack is pretty common with these, a Timesert or similar is the correct repair.</font></div>
<div><font size="2">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.</font></div>
<div><font size="2">Beyond that the bending loads increase with RPM, due to the recip weight heavily loading that center main, and it gets overloaded.</font></div>
<div><font size="2">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.</font></div>
<div><font size="2">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.</font></div>
<div><font size="2">When the load gets too heavy the wear will be mostly on the crankpin side of the journal; it will be very obvious.</font></div>
<div><font size="2">At that point a center strap will help for sure but the loads will still be there unless weight is reduced.</font></div>
<div><font size="2">This is why I try to focus on torque vs high RPM HP with these engines.</font></div>
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<div><font size="2">Glen</font></div>
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<div dir="ltr">On Mon, Jan 13, 2020 at 10:43 PM Nick Black via Fot <<a rel="noopener noreferrer" shape="rect" href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>> wrote:<br clear="none"></div>
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<div id="gmail-m_3780049604753163361yiv9217778070yqtfd38436">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 clear="none">
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 clear="none">
How about a complete set of fasteners for the mains? Does ARP make anything?<br clear="none">
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Motoring on in NORCAL<br clear="none">
Nick<br clear="none">
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Sent from the wilds of NorCal <br clear="none">
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