The fulcrum length is different. But I guess that's only one part of the equation though.
The pushrod side should be disregarded,one is 1.6 and one is 1.5
This pic is worth a thousand words. I assume that these Cranes are both for a BigBlock and one is called a 1.5 and the other a 1.6 ratio. But unless it's a major illusion there are distinct differences between the pivot and pushrod end making these closer to the same actual ratio REGARDLESS of what it's labeled. Even more reason to mock things up and see.
