redlariet - I don't really want to change the firing order, but I'm shocked to find out that I can! How would I do that? I would have to change the crank, unless I'm missing something, becuase the pistons reach top dead center in a certain order dictated by the crank, right? The reason I'm interested is that there are hundreds of mustang cams, and like I said ONE for mine in the Crane catalog. I would like to read anything you have about changing the firing order. Thanks.