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<p>From my short looking on the internet I believe the "rare" part
of the manifold is the area where the thermostat mounts. For those
fussy about exact date codes etc. that rarity might have
relevance. As a cast iron 4 bbl. manifold..., it is only that.
From a weight savings advantage you would probably be better off
with any dual plane aftermarket aluminum 4Bbl. manifold which used
would cost about $100. Below is from a website:</p>
<p><i><span style="color: rgb(56, 58, 59); font-family: "segoe
ui", "helvetica neue", Helvetica, Roboto,
Oxygen, Ubuntu, Cantarell, "fira sans", "droid
sans", sans-serif; font-size: 15px;
font-variant-ligatures: normal; font-variant-caps: normal;
font-weight: 400; letter-spacing: normal; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);
text-decoration-thickness: initial; text-decoration-style:
initial; text-decoration-color: initial; display: inline
!important; float: none;">"About February/March 1965, all the
manifolds were changed to remove the thermostat pocket from
the manifold and make it part of the thermostat housing. The
newly released 2V and 4V intake manifolds carried the casting
numbers C5OE-9425-B and C5OE-9425-C, respectively. Note that
the stamped letters were B and C for the 2V and 4V,
respectively, and matched the last letter of the casting
number."</span></i></p>
<div class="moz-cite-prefix">On 5/29/2022 7:56 AM, Larry Mayfield
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:000401d8736c$4de030b0$e9a09210$@mayfco.com">
<p class="MsoNormal"><a
href="https://www.ebay.com/itm/134061094395?hash=item1f36a9f5fb:g:CjkAAOSwEYliOMnP"
target="_blank" moz-do-not-send="true"><span
style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#111820;background:white"><o:p></o:p></span></a></p>
<h3 style="margin:0in"><u><span
style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#111820;background:yellow;mso-highlight:yellow;font-weight:normal"><a
href="https://www.ebay.com/itm/134061094395?hash=item1f36a9f5fb:g:CjkAAOSwEYliOMnP"
target="_blank" moz-do-not-send="true"><span
style="color:#111820">OEM Ford 4 Barrel Intake Manifold
C50E-9425-A 4F12 289 302 65</span></a></span></u></h3>
</blockquote>
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