A lot of shops claim to be custom camshaft designers, but what do they really design? A custom cam specification (i.e. Duration @ .050” and Lift etc.) is not a complete custom camshaft design; bottom-line, know your shop and their capabilities. If they aren't using design software or performing post-manufacturing analysis of their “designs”, they are most likely just telling a salesman the specifications they require and letting third-party salesman/engineers handle the dirty work. Why does it matter? You, as well as the shop, have no real idea what you are receiving after the camshaft is manufactured.