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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>I heard from a guy who does this kind of stuff for a living. He said the last “C” in the date code is actually the shift that it was manufactured (machined) during. 1<sup>st</sup> shift is A, 2<sup>nd</sup> is B, and 3<sup>rd</sup> is C. So my guess is that the block was cast a couple of weeks before machining, then on the early morning if the 31<sup>st</sup> of March it was machined and made ready for assembly. He said the probability of fonding a matching date code down to the shift was pretty slim. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Mayf<o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"><span style='color:#1F497D'><o:p> </o:p></span></a></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> J D Johnson [mailto:j_d_johnson@earthlink.net] <br><b>Sent:</b> Saturday, October 28, 2017 7:34 AM<br><b>To:</b> Larry Mayfield <drmayf@mayfco.com><br><b>Subject:</b> RE: [Tigers] All I have to do is learn how to type. "5s" & "6s" do look kind of alike.<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Unless I'm completely misinformed, the final letter of the assembly date = engineering level change,<br><br>JD<br><br>At 05:08 AM 10/28/2017, you wrote:<br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Interesting date code you sent. What does that last “C” mean.. rest of it says March 31<sup>st</sup>, 1966 [6=1966, C= March, 31is day of the month, last “C” =?????]. Perhaps where it was machined? <br> <br>mayf<o:p></o:p></p></blockquote></div></body></html>