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256 with 272 heads from factory?

Posted By Starlifter 7 Months Ago
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Starlifter
Posted 7 Months Ago
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I acquired a 56 F100 frame with a Y block engine. Decoding the frame VIN it indicates the truck was equipped with a 272. 2V. The engine block is cast with EBY (256) the heads are cast with ECZ (272). Pulled the distributor and it has 14 tooth gear and hex drive. Is this a 272 engine that possibly cam with truck or down the line did someone put 272 heads on a 256 block. What else can I do ie drop oil pan, pull cylinder head to help verify what I have?
oldcarmark
Posted 7 Months Ago
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The Casting # EBY is 1954 Mercury 256. Looks like someone swapped Motor and installed 272 Heads. You can get more ID Information by going to John Mummerts Site using the "Links" at top of Page.

http://forums.y-blocksforever.com/uploads/images/b9ec8c4e-313b-486f-b1b0-422e.jpg http://forums.y-blocksforever.com/Uploads/Images/a82cee8f-be33-4d66-b65d-fcd8.jpg  
darrell
Posted 7 Months Ago
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pull of the flywheel pan and check the crank flange.the 3.3 crank 272 and 292 will have a half moon cutout and opposite will have a recess cut out of the crank.its about an inch long and not very deep the 256 crank will have the half moon only.
Starlifter
Posted 7 Months Ago
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The trans had already been removed so if I understand you you I should be able to look thru the hole in the bell housing at the rear crank flange. I’m currently looking at some pictures online of crank flanges. Also from reading if someone did put 272 heads in 256 block sealing between intake and head would be critical. Looks like a 272 has .030 more stroke as well. I’m not even sure if this engine ran. Could have been someone swapped parts couldn’t get it to run and gave up? I got the frame and engine for free so nothing lost. Thanks for advice I’ll start digging more into it tomorrow.
KULTULZ
Posted 7 Months Ago
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There were two 239's, one cast in DEARBORN (DIF) and the other in CLEVELAND (CF).

The DIF 239 was the oddball engine and saw assembly in the PASS CAR. The CF 239 was a different design, forerunner of the 272-292.and was used in LT. The 256 was used in PI, MERC (both 1954)  and LT and HT (1954-1955). The 272 was introduced in 1955 as a running change, although cataloging shows it as 1956.

There is where the confusion is.


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yalincoln
Posted 7 Months Ago
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they still used 256's in busses in 56!

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.
Starlifter
Posted 7 Months Ago
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Ok since the engine isn’t rotating (yet) I pulled the bell housing, clutch and fly wheel. After all that looking at crank flange it appears to be a 256. Bummer. I also noticed the drivers side head has a different casting number. E1N or something like that. I will continue to look it over but not sure if I want to invest any money in this one. I have a 351, 460 and a Cadillac 429 as options as well.
darrell
Posted 7 Months Ago
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someone might want it.you can make a 272 or 292 out of this block.
Starlifter
Posted 7 Months Ago
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I’ll need to clean it up, check cylinder bore size and give it some thought. I’ve got plenty of metal work to do on the 56 F100 cab first.
pintoplumber
Posted 7 Months Ago
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Your 256 is the same bore as a 272, it has a 3.10 stroke instead of a 3.30 stroke. To turn it into a 272 you would need a 272/292 crank and 272 pistons because the pin height is different on the 256 pistons.

  Dennis in Lititz PA


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