This will vary widely depending on manifold used, and air cleaners used.
If someone measures, they need to specify manifold length and air cleaner length. The carbs are 109mm no matter what (as I recall), but the difference between a Mikuini and old Nissan Comp, FET, Hyashi Racing, Cannon, Pipercross, Lynx, et al can be quite dramatic, over 2" difference. And the Air cleaners? 50mm to 125mm widths+ are available.
Best procedure is to get the manifold/carb setup and then size the cleaners and horns to the size you have available.
If it was EFI, you can get triple bodies as narrow as 25mm with injector mounts in them!
If someone measures, they need to specify manifold length and air cleaner length. The carbs are 109mm no matter what (as I recall), but the difference between a Mikuini and old Nissan Comp, FET, Hyashi Racing, Cannon, Pipercross, Lynx, et al can be quite dramatic, over 2" difference. And the Air cleaners? 50mm to 125mm widths+ are available.
Best procedure is to get the manifold/carb setup and then size the cleaners and horns to the size you have available.
If it was EFI, you can get triple bodies as narrow as 25mm with injector mounts in them!