Ok, so I know I remember reading some on this, but can someone straighten me out on exactly how to ID Posted heads?

Kevin

Hi Kevin,  John Mummert wrote an excellent article about identifying posted heads for Y-Block magazine.  It appeared in issue #32.  If you can, you should pick up a copy.  Hopefully John won't mind if I repeat some of the high points.  If you are lucky, the head number will tell you what you need to know.  Also you can see the stiffening post if the head is off the engine and you are looking through a hole, visible on the head gasket side of the head.  The following heads are all posted:  -471, -113, C0AE, C1AE, C1TE.  None of these heads are posted:  EBU, ECG, ECL, ECA-A, ECZ-B, ECZ-C, ED-ECZ.  Also no heads cast at the Dearborn foundry (DIF) were posted.  Some ECZ-G heads were posted.  All heads cast after May 1957 at the Cleveland foundry (CF) were posted.  Therefore the only heads in question are ECZ-G heads cast at the Cleveland foundry, as there was a running change.  Hope I got this correct, and hope it is helpful.  Nick Brann 

The REASON the ECZ_G heads NEEDED to be posted was at the higher compression 9.5 and up the top of the chamber could fail(collapse). That was not the case with the CLOSED CHAMBER ECZ A, B, C, D heads. Even at high compression ratios. For what its worth. Pete

To add to Nick and Petes comments, here are a couple of pictures.  The arrows in the top picture simply point to the water ports in which you can use your little finger to reach into and feel for the ‘post’ whose locations are represented by the dotted lines.  The second picture simply shows a cutaway of the head in which the post is visible.

  

   

 

Lorena, Texas (South of Waco)