Hi guys,

Almost too good to be true... but finally I may of found some ECZ-G heads(to fix my miss matching head problem) however looking at the photos I’m wondering if the heads have had too much shaved off them?

Can anyone throw in their opinion looking at the pics?









Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.

Here is a past thread discussing adding posts to the ECZ-G heads.
 
http://forums.y-blocksforever.com/Topic47592.aspx
 
It’s really only the ECZ-G ‘unposted’ heads that requires any discussion about adding posts.  All heads made after the ECZ-G heads have posts while the heads preceding the ECZ-G heads are cast in such a manner that the intake runners provides the needed additional deck support.  The ‘G’ heads were the first of the big valve / big port heads which has a lot to do with why the castings changed.
 
With that being said, it’s only the ECZ-G ‘unposted’ heads that requires the addition of ‘posts where there are none.  All small letter G heads are unposted while it’s the big letter G heads that come with and without the posts depending upon when and where they were cast.  The Ford shop manual specifically limits milling of the 1957 heads to 0.010” but it’s generally accepted that you can get away with as much as 0.025”.  I’ve had personal experience with as set of unposted G heads that were milled 0.060” and both heads had a continuous issue with both head gaskets failing repeatedly.  The gaskets were failing on the two cylinders on each bank that had the posts added in the later cast heads.  In this particular instance, the heads were switched out to a pair of milled ‘113” heads and the head gasket problem simply went away.  This was an engine that had the compression ratio bumped to 10.5:1 so it was already at the octane limit of available pump gasoline in the best of circumstances. Hence the need for posted heads.

Lorena, Texas (South of Waco)

Thanks for all the helpful information guys! At this stage it seems like quite a gamble to purchase these heads, especially since they are not posted. Thanks Ted for your sharing your real world experience, it’s always good hearing first hand accounts.

I’ll keep you guys posted is anything develops from this.

Thanks again for the amazing wealth of knowledge!


Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.