Originally Posted by TRF415boy

Well it means you have 0.5° in board toe out on the rear, which you really don't want to have. As i said earlier, the blocks goes from narrowest to widest :

XD XC XB XA X A B C D and there is a 0.5° toe difference between them.

Say your 415 is box stock, with standard suspension, it has 2° outboard toe (in the rear hubs) and the stock setup for it is B-D on the rear, where D is the furter back block, it means you have 3° rear toe : 2° outboard (in the hubs) and 1° inboard (from the blocks).

Hope this helps.