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By GJCAT56 - 17 Years Ago
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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?
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By Tom Compton - 17 Years Ago
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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
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By Ted - 17 Years Ago
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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
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By DANIEL TINDER - 17 Years Ago
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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.
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By PF Arcand - 17 Years Ago
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On this subject, how much compression will un posted "G" heads, that are not milled, normally tolerate? Can they be milled moderately without problems?
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By GJCAT56 - 17 Years Ago
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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.
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By Ted - 17 Years Ago
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PF Arcand (5/20/2008)
On this subject, how much compression will un posted "G" heads, that are not milled, normally tolerate? Can they be milled moderately without problems?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.
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By PF Arcand - 17 Years Ago
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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.
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By GJCAT56 - 17 Years Ago
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 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?
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By Hoosier Hurricane - 17 Years Ago
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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
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By Moz - 17 Years Ago
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hey john would that be the same on the engines that came to australia out of canada my engine is a 58-59 i will see if i can find some numbers on my heads.
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By Hoosier Hurricane - 17 Years Ago
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Moz: Not sure about Canadian engines. John
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By Moz - 17 Years Ago
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im going to check the codes on my heads with the codes on mummerts site im now curious as to what they are ive already checked the block its letters are c.e.b.y which is an export 272.
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By Larry D - 17 Years Ago
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Hi Moz, My Canadian chassis catalogue lists your CEBY as a late '57 272, export or replacement block. As for the heads being posted I can't say for sure, as most of the Canadian produced engines I've come across have non-posted heads. All of our '57 engines, 272, 292 & 312 used the larger valve ECZ-G heads, so yours may have them too. If it's a different number let me know and I'll look it up. Just curious, but do your engine blocks have a two letter prefix and 4 or 5 character serial number stamped on the left front face of the block, below the head up by the valley cover? Yours should have the prefix VG.
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By Moz - 17 Years Ago
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larry ive looked at my heads both are ecz-a its possible the heads may have been changed at some stage this engine came out of a 57 ute i have no idea why the original motor wasnt put back in but this corresponds to our 56 engine specs. the numbers on the front of the block i will look for tomorrow & let you know.
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