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#7 |
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Member Emeritus
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
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AS heads are iron. The C in the PN designates Canadian manufacture...Some Canadian aluminum heads had slightly higher than irn CR's, probably just enough to compensate for the slight power loss. There is a Canadian service bulletin page listing CC's An CR ratings for nearly all USA and Canadian heads from about '32-49
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