Ray,
I found this info. on a 256 ci Ford engine. (Wikipedia )

" Ford Y-block engine..

The Y-block engine' is a family of overhead valve V8 automobile engines produced by Ford Motor Company. The engine is well known and named for its deep skirting, which causes the engine block to resemble a Y. It was introduced in 1954 as a more modern replacement for the outdated side-valved Ford Flathead V8 ' was used in a variety of Ford vehicles through 1964.

256 engine.
The original Mercury Y-block, introduced for the 1954 model year, displaced 256 in³ (4,194 cc). Advertised as the "V-161" engine, it ran a bore and stroke of 3.625 x 3.1 in. The compression ratio was 7.5:1, and the rated power was 161 hp (120 kW) at 4,400 rpm. Torque was 238 lb⋅ft (323 N⋅m) at 2,200 rpm.[3] The engine breathed through a Holley model 2140 (4V) carburetor. The 256 in³ version of the Mercury Y-block was only available in 1954 models and was replaced by the 292 in³ in 1955. "

(Ken H..)