Original Message
It sounds stock to me.
By Dave Shoe - 05/11/2003 8:59:10 PM; IP 216.243.176.34
The two heads are C6AE-Rs, and will be basically identical, though some insignificant variations might be found, such as the "Big R" version from Cleveland might have three reinforcement ribs in the water jacket atop the exhaust valve pockets to stiffen the exaust valve seat when the head is torqued down, and the C6AE-R head (probably from DIF) may not have the ribs. Functionally, they're the same.

Minor mixing of these castings are quite common. It's undesirable to mix C6AE-R heads with C6AE-J, -L, -U, or Y heads, as these have different runners, and the C6AE-U and -Y have different chambers, too.

Your "R" heads are desirable castings.

Shoe.
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Collapse <a href=../ForumFE/reply.aspx?ID=17166&Reply=17166><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17166" onclick="return false;">Mixed matched heads from the factory?</a>&nbsp;-- <font color=#0000ff>Mike Harris, <i>05/11/2003</i></font><script type="text/javascript">
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 Mixed matched heads from the factory? -- Mike Harris, 05/11/2003
 Prob. just different castings of the '-R' head. No biggie. [n/m] -- Mr F, 05/11/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17169&Reply=17166><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17169" onclick="return false;">RE: Mixed matched heads from the factory?</a>&nbsp;-- <font color=#0000ff>Travis Miller, <i>05/11/2003</i></font><script type="text/javascript">
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 RE: Mixed matched heads from the factory? -- Travis Miller, 05/11/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17170&Reply=17166><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17170" onclick="return false;">RE: Mixed matched heads from the factory?</a>&nbsp;-- <font color=#0000ff>Mike Harris, <i>05/11/2003</i></font><script type="text/javascript">
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 RE: Mixed matched heads from the factory? -- Mike Harris, 05/11/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17171&Reply=17166><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17171" onclick="return false;">What are the date codes? N/M</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>05/11/2003</i></font><script type="text/javascript">
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 What are the date codes? N/M -- Royce Peterson, 05/11/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17173&Reply=17166><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17173" onclick="return false;">RE: What are the date codes? N/M</a>&nbsp;-- <font color=#0000ff>Mike Harris, <i>05/11/2003</i></font><script type="text/javascript">
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 RE: What are the date codes? N/M -- Mike Harris, 05/11/2003
 More like '5L22', sure. That'd be 22 Nov., 1965. [n/m] -- Mr F, 05/11/2003
Collapse <b>It sounds stock to me.</b>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>05/11/2003</i></font>It sounds stock to me. -- Dave Shoe, 05/11/2003
 RE: It sounds stock to me. -- Mike Harris, 05/11/2003
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