The best replacement for b18 block is b20.

The best alternatives to b18 block are rated as following:
★★★★★  b20
★★  b16 block
★★  b20 block

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Speaking about b18 block, one probably shouldn't forget about b16 head.

Other search terms related to b18 block and their ratings are:
★★★★★ b16 head
★★★★★ b20 head
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b18 block
b20
b16 block