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The first Y-block on Ford automobiles and F100 trucks was the 239 cu in (3,910 cc) version as released in 1954 with EBU casting numbers. The Y-block was the same displacement as the old Ford Flathead V8 that it replaced but with a bigger bore and a shorter stroke (3.5 x 3.1 in).
Cutaway showing thin-walled, deep-skirted, Y-shaped FE block (ending above the darker colored rectangular oilpan) The FE and FT engines are medium block [citation needed] designs, referred to as Y-block because the cylinder block casting extends below the crankshaft centerline, [citation needed] giving great rigidity and support to the crankshaft's main bearings.
The first-generation Y-block was the 317 cu in (5.2 L), which replaced the undersquare 337 cu in (5.5 L) flathead V8 on all Lincolns in the 1952 model year and was produced through 1954. [2] The 317 was oversquare, as was rapidly becoming the fashion, with a bore of 3.80 in (96.5 mm) and a stroke of 3.5 in (88.9 mm).
The Ford MEL is a big-block 90° V8 engine family produced in various configurations by the Ford Motor Company between 1958 and 1967 in displacements from 383–462 cubic inches (6.3–7.6 L), and used in Ford, Edsel, Mercury, and Lincoln vehicles.
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There were a few different versions of the LT1. All feature a cast iron block, with aluminum heads in the Y- and F-bodies, and cast iron heads in the B- and D-bodies. Corvette blocks had four-bolt main caps, while most other blocks were two-bolt main caps. Block castings remained the same between 2 and 4 bolt mains.