<TABLE width="100%" border=0 itxtvisited="1"><TBODY itxtvisited="1"><TR itxtvisited="1"><TD vAlign=top itxtvisited="1">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?
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The -G heads are the best heads made for the Y-block. But if you're running a stock cam, you might get the same performance from -C or other heads.

Yes, you can stroke the 256 to 272.