The best replacement for b18 head is b16 head.

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

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Speaking about b18 head, one probably shouldn't forget about b20 block.

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