I know I should look this up myself...but I'm being lazy.
From a structural standpoint, what's the difference between forged and cast? If you don't plan on hitting it with Nitrous or have severe detonation issues do they make that much of a difference?
From the question I'm assuming you didn't take metalurgy class. And since you probably don't want a trip down metalurgy lane, here's an analogy for non metal experts; You could make your furniture out of pine(cast) or walnut(forged). The pine furniture is fine but when someone decides to 'dance on the table' you will wish you had walnut.
