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By Cliff - 6 Years Ago
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Anybody know what these are? in looking through my stock pile I found these, early heads no freeze plugs, stamped with a G after the cast EBU.
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By charliemccraney - 6 Years Ago
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239
http://www.ford-y-block.com/cylinderheadchart.htm
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By Cliff - 6 Years Ago
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No freeze plugs all early heads have freeze plugs, also G stamped next to the cast EBU
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By charliemccraney - 6 Years Ago
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The date code looks like May 3 1956. I'm sure replacement heads were cast. Maybe it's simply a replacement. The ports, valve size and chambers look right for 239. Sometime toward the middle of '56 production, heads began to be cast without core plugs.
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By darrell - 6 Years Ago
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must be a replacement.cant get a good look at the sparkplug holes are they still the small plugs.
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By Cliff - 6 Years Ago
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What about the G stamped into the head?
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By charliemccraney - 6 Years Ago
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Maybe it just indicates a revision, since there are some differences from the original EBU castings. What size are the spark plug threads?
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By Cliff - 6 Years Ago
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Large
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By darrell - 6 Years Ago
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interesting changes no core plugs and went to the later plugs.just when you thing theres nothing left to see in y blocks along comes something new.i dodnt thing ill live lone enough to see it all.
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By Ted - 6 Years Ago
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Cliff (11/24/2018)
What about the G stamped into the head?
Keep in mind that the 239 engine was used as the base V8 engine in the Ford pickups after 1954. EBU-G heads are not to be confused with ECZ-G heads. When someone says they have ‘G’ heads, it needs to be clarified which ‘G’ head.
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By darrell - 6 Years Ago
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the ebu 239 was a 54 only engine with the large cam.the truck was ebv and used a small cam.the mixup came when they used the ebu engines in early 54 trucks by mid year they no longer used it.the ebu is the only real oddball y block.all others use the small cam and same head gaskets.
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By Cliff - 6 Years Ago
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These heads take the early head gasket, but have 18 mm spark plugs, also the chambers do not over hang the cylinder (well a little at the sides with a 3.860 bore) also has the late exhaust port, I think i'm going to sonic check the insides of the ports for fun.
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By Cliff - 6 Years Ago
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I took a look inside, these will take a 1957 size port without hitting water, these maybe a better head to start with, better chamber to work with. 
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By charliemccraney - 6 Years Ago
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As long as it wasn't the last one on earth 
I wonder how that actually compares to a '54 EBU head. If the part of the mold for the water jacket was '56, like many other features, it very well may have more material there.
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