The best replacement for b16 block is b18 block.

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

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

Other search terms related to b16 block and their ratings are:
★★★★★ ls head
★★★★★ b18 head
★★★★★ gsr head
★ b18c head
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b16 block
b18 block
gsr block