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AFAIK B2 B7 B3 (and 8-v B8 B6) have smaller valves and different distance between valves, so reliefs doesnt match either way. on the other hand, there's some minor clearance between (at least z6 head) and pm3 bottom, so yes it can be done, unless you want to go bigger cam.

personally i chose to enlarge reliefs with a dremel for a good clearance.
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