.557" purple shaft 318?

wanting just to throw the cam in i went for the safer option of 284/528

[ame="http://www.youtube.com/watch?v=FEjAaBpVkxg&list=UUk8YjfNAdokNHAhR8IkY-Vg&index=3"]318 284 .528 cam - YouTube[/ame]