Chrysler A engine
The Chrysler A engine is a small-block V8 gasoline engine built by Chrysler with polyspherical combustion chambers. It was produced from 1956 until 1967, when it was replaced by the wedge-head LA engine. It is not related to the hemispherical-head Hemi engine of the same era.
Lincoln Y-block V8 engine
A useful comparison is the Oldsmobile V8 engine, which came in both small-block and big-block versions from 1965-1976. Both blocks have a bore spacing of , almost exactly the same as the Lincoln Y-block, but differ in deck height, with the small-block's being and the big-block's . By this measure the Lincoln Y-block has a larger engine block than the Oldsmobile "big-block." In comparison, the Ford FE engine has the same bore spacing but a deck height of .