Hey Dave, My W5s don't need too much spread like 2*, heads like Js need a ton , I think that RJ and Vic are both correct, We stayed with a smaller cam and maxed out intake lift which netted great results< thanks Vic > RJ spec ed us a cam that will make more power than our current one but at the cost of some more RPM which on this block I dont want to do, So my point is its a balance on how much power vs how much piston speed