“Allison GGR Engine” ???

I have drawings of a proposed aircraft from 1946 that was to have an “Allison GGR engine.” This was an inline piston engine to turn a propeller, but is otherwise not described. Does an “Allison GGR” ring any bells?

Update: never mind. The drawing is poor… what I read as “GGR” appears to actually be “G6R,” a variant of the V-1710 engine.