I have been doing some reading and have a question on posted heads. What are they and exactly when did they come out?  Does this refer to a modification to the internals or the outside of the head?

I understand they came out in May 1957.  Later G heads and all 113s and I believe 471s.  Mod is internal.

Here is site to head info

http://www.ford-y-block.com/cylinderheadchart.htm

TC

You gotta have the right tools and know how to use 'em.

TC - Austin, Texas

To add to Tom's info, here’s a link to a previous discussion on how to identify posted heads.  Using the seach function and ‘posted heads’ will also bring up more information on the subject.

 

http://www.y-blocksforever.com/forums/Topic6711-3-1.aspx

Lorena, Texas (South of Waco)

Before '57, when the factory started casting heads with support posts, people with milled heads would sometimes drill through the water jacket and install a threaded rod to reinforce the chamber roof.

6 VOLTS/POS. GRD. NW INDIANA

On this subject, how much compression will un posted "G" heads, that are not milled, normally tolerate? Can they be milled moderately without problems?

Paul

Well I bought a set of "G" heads this weekend and that was going to be my next question How much compression will they handle without the posts? I plan on building a 312 to put in a 56 C600 that will set on a 1 ton frame. Its going to be more of a tow truck for my 64 Tbolt wagon than a work truck. Right now its got a 272 in it and the guy who sold me the heads has a couple of 312 shortblocks stashed. I think I will go to see them this weekend to see how good they are. I would like to put a tripower on it for the "wow" factor, along with dual exhausts.

Prior experience says 9½:1 CR is the limit for the unposted “G” heads and this is with head milling being limited to 0.025”.  But I see where the 1957 Ford Service Manual limits milling to 0.010”.   Premium fuel is still required for 9½:1 CR in this instance.  The compression ratio being at 10.4:1 and using heavily milled unposted “G” heads tends to blow head gaskets reasonably easy and that's regardless if FelPro or Best Gaskets are being used.

Lorena, Texas (South of Waco)

Cat; re the 312 blocks, carefully check them for cracks around the main bearing bolts. Unfortunately, at this late date many are damaged. And if you do build a 312, do not over tighten the main cap bolts! If in doubt on any of this, you might refer to Ted or John "H" for advice.

Paul

Well I went to look at the two engines on sat and both were not 312s. The one was a 272 that had been cleaned and the crank ground but both had surface rust from setting. The other had the correct block #s but was a 292 according to the main caps. Oh well I`ll keep looking. any Idea how a 272 runs with 312 heads?

In '57 Ford put G heads on all the V8s.  That's probably why you used to hear guys say, "my uncle had a '57 Ford with a stock 272 and it could outrun ********* any day of the week".  They must have liked the big intake valves.

John in Selma, IN

John - "The Hoosier Hurricane"