I will probably weld the flanges together. When i designed the headflanges about 2 or 3 years ago, i didn’t really know a whole lot about headflange design, I just copied the factor manifolds, which were 2 X 3.
It will be equal length, if it wasn’t I wouldn’t do this in cad, I’d just wing it.
There is a fair amount of room for the manifold:
