Hello

   I've run across two sets of  ECZ-G heads,  I can buy one set for $125.00
my question is this, is it worth the money for these heads even if they don't have the "post"
Reading Tims  pages, I don't think for the money spent that you can mill and resize the valves
for under $400 each in my area.
 Also reading about the casting letter (size) how would one know if you have nothing to compare with
Best

Sanddoc.  The link below should help you with determining whether you have the large letter G heads or the small letter ones. 
http://forums.y-blocksforever.com/Topic113734-1.aspx
The picture you posted is the large letter G series cylinder head.

As you may have read, a large number of the G heads used on '57 production Fords, Mercurys, Thunderbirds, and trucks were un-posted.  John Mummert's chart indicates that the posting of heads began in May of the '57 model year.  To my knowledge there was never a recall of any '57 FoMoCo vehicles to replace cylinder heads. 

IMO unless you're planning to build some high compression ratio engine, I would not hesitate to use a set of un-posted heads.  With the use of composite head gaskets, the effective size of the combustion chamber is somewhat increased and the static compression ratio is therefore reduced from what you would have had when the engine was originally built by Ford.  See the link below for a chart from Ted Eaton that indicates the number of ccs to add to the effective combustion chamber volume of the cylinder head you're using because of the compressed thickness of the particular brand of head gasket you're using. 
http://www.eatonbalancing.com/blog/2012/06/30/head-gasket-volume-calculation/

As an example, Ted's chart shows a Ford C1AE steel shim head gasket will effectively add 5.24 ccs to the volume of a y-block combustion chamber.  A Best Gasket composite type head gasket will effectively add 10 ccs to the volume of a y-block combustion chamber.  4.76 ccs added to the volume of a combustion chamber reduces the engine's static compression ratio.

Milling the heads is one way to reduce the combustion chamber volume to increase the static compression ratio.  As you get into this stuff, you'll find that a stock y-block will usually have pistons .020 or .025 below the engine block deck surface when they were originally produced.  Having your machine shop square the engine block and zero deck the pistons will do more to increase your y-block's actual compression ratio and insure that the above the piston cylinder head quench space does not become excessive.

Getting back to your question about how much are a set of un-posted G heads worth.  IF the heads you're looking at have not been previously milled, the deck surfaces and combustion chambers are not pitted, AND the heads have not been out-in-the-weather so that the intake ports, exhaust ports, valve cover area, and other surfaces are all rust colored, I'd expect to see them offered for $150 - $200 at a local car show in my area.

Reconditioning prices for cylinder heads can vary geographically.  Too, what needs to be done?  Milling the heads, grinding the valves and seats, valve guide work (if needed), replacing valves if they don't have enough margin to permit being ground again, installation of hardened exhaust seats, it all adds up.  For my use, I stick with the original umbrella valve seals and utilize the '55, '56 rocker arm oil deflector trays.  IF you have positive valve stem seals installed, they'll add to your machine shop cost, too.  Many people prefer and are using the newer positive valve stem seals.

Hope this helps.      


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Thanks for you input NoShortcut.
  I've mostly been a 335 guy for years, this Y block is all new to me...
I'm thinking of buying all four heads, if I get the right price.
 Well  I thought the guy accepted my offer, but did not return my email last reply to him, we'll see what today brings
  Best
Dave