256 y block
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Joined: Jan 2009
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256 y block
Pulled apart my 55 F-100 272 with g heads and both were cracked, left side was there for a while. My question is on a 256 Mercury I found.
Was wondering if my crank from the 272 will work in the 256 Merc making it a 272 again with the longer displacement? The casting letters were EBY and the heads had a 4 barrel manifold on it, though someone adapted a 2 barrel carb. Can this block be punched out to a 292 standard like the 272?
Couldn't get to the head letters but from my research looks like it came out of a 54 Merc with a 4 barrel. Has a monster looking auto trans hooked to it now, I have a 3 speed w/od that came with my truck I run.
My 272 with the ECZ-G heads, stock ignition and 2 barrel, ran pretty good and I did not want to do all this work and end up with any less performance. Was going to run a newer 4 barrel and distributor on it, and stock manifold and heads ( looks like they are EBY to). Is it worth all the trouble, or should I just go get some good G heads?
Was wondering if my crank from the 272 will work in the 256 Merc making it a 272 again with the longer displacement? The casting letters were EBY and the heads had a 4 barrel manifold on it, though someone adapted a 2 barrel carb. Can this block be punched out to a 292 standard like the 272?
Couldn't get to the head letters but from my research looks like it came out of a 54 Merc with a 4 barrel. Has a monster looking auto trans hooked to it now, I have a 3 speed w/od that came with my truck I run.
My 272 with the ECZ-G heads, stock ignition and 2 barrel, ran pretty good and I did not want to do all this work and end up with any less performance. Was going to run a newer 4 barrel and distributor on it, and stock manifold and heads ( looks like they are EBY to). Is it worth all the trouble, or should I just go get some good G heads?
Cargo Master
Joined: Feb 2008
Posts: 2,795
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From: Windermere Valley,B.C. Ca
https://www.ford-trucks.com/forums/forum56/
To answer your last question, and just my personal opinion, it’s probably not worth the effort, just get new heads, also (and please don’t take this wrong), the y block has some inherent design limitations over newer types but of course it’s your money.
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Joined: Mar 2002
Posts: 2,070
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From: Boise, Idaho
Yes, you can stroke the 256 to 272. Or, for a few more dollars, you can stroke it to 283 by having a 312 crank turned down to fit the engine.
You can sometimes bore a 272 to a 292.
You might find the casting numbers on the EBY heads on the side of the head between the exhaust ports.
If that were my engine, I'd run the 256 as-is. Maybe locate a Carter WCFB or a Rochester 2G or 2GC to fit the intake manifold.
You can sometimes bore a 272 to a 292.
You might find the casting numbers on the EBY heads on the side of the head between the exhaust ports.
If that were my engine, I'd run the 256 as-is. Maybe locate a Carter WCFB or a Rochester 2G or 2GC to fit the intake manifold.
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