A major reason for 60° bank angle choice today is FWD's space limitations: the cross-wise engine length is better than L4 by several inches* but the width radiator to firewall is less than a 90° (which would be shorter top to bottom).

Engine lengths (all plus accessory drive)
V6: 3 × bore pitch + 1 rod width (roughly 1")
L4: 4 × bore pitch
V8: 4 × bore pitch + 1 rod width
L5 (Volvo, Audi): 5 × bore pitch
V10: 5 × bore pitch + 1 rod width
L6: 6 × bore pitch
V12: 6 × bore pitch + 1 rod width

Boffin Emeritus