Well, since A4 blocks have been out of production for years, your choices are: 1) stock block. 2) M-6010-B50 sportsman block. The B50 is only a little stronger than a stock block. 3) M-6010-R302 this is the race block that replaced the A4. 4) One of the new DART blocks, vert strong. or, 5)M-6010-F302, the expensive Aluminum block. Check your wallet and pick one.
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Some people can break a cannon ball, in a sandbox, with their bare hands.
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