<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>I've heard that as well but I don't know who could confirm it. I was told by a reputable source that the early blocks have less core shift than the later blocks. The explanation was that the molds, machinery, tooling, etc. were newer/not worn. I don't know if that is true. My D0AE block had very little core shift and has relatively good cylinder wall thickness when compared to other 351c blocks. X's in the lifter valley were to help prevent cracking on later blocks as I understand it so does that mean there were major cracking issues on early blocks?</div><div><br></div><div>Rather than buying the block in the Ebay ad, I would jump for an aftermarket 351w block and put Cleveland heads on it. The only thing the NOS block does for you is give you more cylinder wall thickness; you will still have to deal with oiling issues and increased parts cost. </div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><br><div><div>On Dec 28, 2013, at 9:28 AM, <a href="mailto:michael@michaelshortt.com">michael@michaelshortt.com</a> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><p dir="ltr">Perhaps the best thing to do is to share the casting numbers from most to least desireable. Wasn't there some advantage to using a 1970 351 2V block as the basis for a heavily modified high hp engine?</p><p dir="ltr">Michael Shortt</p>
<div class="gmail_quote">On Dec 28, 2013 11:22 AM, "Jerry Knotts" <<a href="mailto:knottsj@galstar.com">knottsj@galstar.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
I guess I am not sufficiently schooled in the differences in blocks, if any. I thought that the Boss block was somehow different for the standard 4 bolt 351C block. ???<br>
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Don't always pay close attention<br>
jerry<br>
<br>
On 12/28/2013 10:00 AM, Paul Rimov wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hey dudes there is a NOS advertised block on Ebay.<br>
<br>
<a href="http://www.ebay.com/itm/NOS-351-Cleveland-Engine-Block-4-Bolt-Main-Pantera-Boss-Mustang-Cobra-Jet-/321285002971?pt=Motors_Car_Truck_Parts_Accessories&hash=item4ace1416db&vxp=mtrOn" target="_blank">http://www.ebay.com/itm/NOS-<u></u>351-Cleveland-Engine-Block-4-<u></u>Bolt-Main-Pantera-Boss-<u></u>Mustang-Cobra-Jet-/<u></u>321285002971?pt=Motors_Car_<u></u>Truck_Parts_Accessories&hash=<u></u>item4ace1416db&vxp=mtrOn</a> Dec 27, 2013, at 11:00 AM, <a href="mailto:detomaso-request@poca.com" target="_blank">detomaso-request@poca.com</a> wrote:<br>
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Paul<br>
<br>
</blockquote>
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