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if you shave the block you will get less drop but the block is a certian thickness and that is what the drop will do. you can install a drop shackle and get some drop as well....mike
 

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you can install a drop shackle and get some drop as well....mike
IMO a drop shackle would be better. Blocks have a bad habit of applying a lot of leverage on the springs when you start or stop (axle wrap). If you like to take off fast you'll notice it even more as a thumping or binding feeling coupled with a loss of traction.
Replacement shackles dont have this negative side effect.
 
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