1958 Dodge

The Dodge hemi/poly has one of the smallest bore spacings (bore center to center distance) of just about any (or maybe any) American V8 ever. Viz:

Dodge hemi/poly: 4.1875 inches

Desoto hemi: 4.3125

Chrysler hemi/poly: 4.5625

Mopar A/LA: 4.46

Mopar B/RB: 4.80

Ford small block: 4.38

Chevy small block: 4.40