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By Rmc292 - 12 Years Ago
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I have a set of 272 heads and was wondering if they will work no my 312 short block.
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By John Titman - 12 Years Ago
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Sure, 272 heads will fit but, I wouldn't waste your time. The 272 valves and ports a dismally small and the chambers all small too
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By The Master Cylinder - 12 Years Ago
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John Titman (9/6/2013)
Sure, 272 heads will fit but, I wouldn't waste your time. The 272 valves and ports a dismally small and the chambers all small too
It depends on what year 272 heads. The '57 272 heads are the same ECZ-G heads that are on the 292 and 312. The '56 ECZ-C heads were also fitted to the 272, 292 and 312 and are reasonably good for a street engine.
You need to go by the casting # not the engine size. Check Mummert's site for more info.
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By NoShortcuts - 12 Years Ago
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Hmmmm... John is correct, they will fit. That said, don't write those heads off because they came from a 272.
Check John Mummert's web site @ www.ford-y-block.com in the 'Technical Info.' section, sub-heading 'Cylinder Head Chart'...
John's head chart shows that Ford used some 11 different cylinder heads on the 272 blocks between 1955 and 1958.
Intake valve size on those heads was 1.78 inch in '55 and '56 and 1.92 inch in '57 and '58.
1.78 inch intakes were used in '56 on the 312s. 1.92 inch intakes were used on 312s in '57, '58, and '59 on Fords or Mercurys.
Additionally, some of the same heads used on 272s were also used on 312s. Examples: ECZ-As, -Bs, and -Cs in '56, the ECZ-Gs in '57 and '58
When used on the 312s, Ford's advertised compression ratio for the ECZ-As 8.0:1; ECZ-Bs 8.4:1; ECZ-Cs 9.0:1; ECZ-Gs 9.7:1
What are the casting letters on the ones you have?
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By Rmc292 - 12 Years Ago
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So, I went to y-block.com and pulled my head from the list.
56 ED-ECZ-C 272 1.78" 8.5 56 Pick-up
By what I read from your replay these heads should work on the 312 also, correct?
THX
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By The Master Cylinder - 12 Years Ago
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Yes, But other heads would be better if you are considering high performance.
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By NoShortcuts - 12 Years Ago
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The Master Cylinder is telling you straight.
The 'C' heads are okay for the street. It always comes down to what you're trying to do and how you're REALLY going to use the engine. For years, the sought after original equipment heads were the ECZ-Gs. Some of us have come to like the 5752-113s because they seem to have a little less valve shrouding and ALL of those produced were 'posted'. The 5750-471 heads are a consideration, too, if you're going to use domed pistons or a supercharger ($$$) or turbocharger ($$$) system.
Today, if you can see your way to do it, the aluminum cylinder heads that John Mummert and his son designed and are assembling after having them produced, are THE thing to think seriously about.
If you take a set of stock heads, have hardened valve seats installed, have them professionally ported, new valve guides, positive valve stem seals, new stainless steel valves, valve springs, quality one piece spring retainers, and quality hardened valve spring keepers installed, ...you might as well buy a set of the Mummert heads and be ahead of the game.
Out-of-the-shipping box and installed, the Mummert heads have been dynamometer shown to yield a ~50 horsepower gain over a set of the FoMoCo 113s!
Again, think hard about how you're going to use your engine build. Assembling a completely gone through y-block dead stock is not the most economical engine to rebuild. More than one of us has gotten caught-up in this endeavor. Thank the Lord, my wife hasn't left me yet! Remember, when you get all done, you want to be able to enjoy what you've done, too!
Hope this helps. 
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By ian57tbird - 12 Years Ago
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What do you mean by "posted"?
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By slick56 - 12 Years Ago
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ian57tbird (9/7/2013)
What do you mean by "posted"?
The heads have "posts" in the water galleries above the combustion chambers.
Makes for a stronger head with less flex under compression.
Link to J Mummerts site here for part no's.
http://www.ford-y-block.com/cylinderheadchart.htm
Link to thread for more info
http://forums.y-blocksforever.com/Topic77490.aspx?Keywords=posted%20heads
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By slick56 - 12 Years Ago
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Another link showing how to add posts. Excellent article from Grovedawg.
http://forums.y-blocksforever.com/Topic47592-3-1.aspx?
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By NoShortcuts - 12 Years Ago
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ian57tbird (9/7/2013)
What do you mean by "posted"?
I've read that the early 1957 FoMoCo y-block cylinder heads used on the supercharged engines, casting letters EDB-D, sometimes failed in racing use. Apparently, the supercharger increased combustion chamber pressures sufficiently for the roof of the combustion chamber to be pushed upward.
Subsequently, Ford changed the head design internally by adding a series of steel support rods. My recollector thinks the rods were 7/16 inch in diameter. The supercharger heads with the support rods (posts) were designated with the casting letters EDB-E.
According the cylinder head chart on John Mummert's web site at www.y-block-ford.com, along about May of the '57 calendar year, the large letter ECZ-G cylinder heads (used on all normally aspirated y-blocks in the '57 model year -272, 292, and 312) began being produced with these same support rods (posts) incorporated in the head casting.
The above said, there is another series of y-block cylinder heads that were also produced during the 1957 model year. These also bear the casting letters ECZ-G but the letters face the opposite direction on the head and are noticeably smaller in height and width. ALL of these heads are un-posted and I've only found them on engines in '57 vehicles.
Sooo... there are 'posted' and un-posted ECZ-G cylinder heads depending on when they were produced.
IF you use the Forum 'Search' function, there are a couple of threads where individuals describe how to post un-posted heads. There's one thread where a member posted pictures of how he did it step-by-step.
Hope this helps to answer your question.
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By ian57tbird - 12 Years Ago
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Interesting! My car is late 56 production, so I guess if the parts are original then it is un-posted. Thanks for the info guys.
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By NoShortcuts - 12 Years Ago
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Hi Ian,
It's my understanding that ALL '57 'Birds had the large casting letter ECZ-G cylinder heads. -Even the ones that were still being rolled out in December of 1957 which was well into the production of the 1958 model year cars.
MANY 1957 Fords had 'un-posted' heads. From John Mummert's information regarding when the 'posted' heads started being produced, late 1957 model year production Fords and Mercury y-blocks should have 'posted' heads.
All '58 Mercury y-blocks were 312s and should have posted ECZ-G heads.
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By ian57tbird - 12 Years Ago
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From the style of compliance plate I believe mine is December 12th 1956
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