The heavy-duty front brake caliper bracket has a torque specification of 275 ft./lbs. The rear caliper bracket for the heavy-duty caliper has a torque specification of 163 ft/lbs for the upper bolt and 190 ft/lbs for the lower bolt. Both versions have a torque specification of 32 ft./lbs. for the guide pins.
275ft./lbs. with a 3/8? Magic.
I had to look it up but it's real, 275 for the bracket bolts.