Buick 3800 S2 differences

[Bizmark]

An odd thing i've noticed with the Buick 3800 series 2 engines, some of them have the thermostat housing facing forward, so the upper radiator hose connects to engine facing the front of it, while some have the thermostat housing facing to the side, so the upper radiator house connects to the engine facing the right side of it. What's the difference between these 2 engines aside from the thermostat orientation?

[azzfox]

Thermo housing facing forward is on ABS models, so the ABS module isnt in the way.

[Bizmark]

Ah ok, i was thinking it'd be something to do with the engine itself, cheers.