Hayes Bicycle Group’s blog has posted up compatibility of their various forks with the Panaracer 650b x 2.3 tire.
(Photos and info were borrowed from the above blog.)
Manitou Minute (non-29er):
Clearance to casting = 3.41 mm
Clearance to crown = 1.06 mm

Manitou Minute 29er:
Clearance to casting = 6.50 mm
Clearance to crown = 16.89 mm

Manitou R7:
Clearance to casting […]