For example, a 3 HP Briggs and Stratton engine required 15.5 or 16 ft-lbs of torque. Start at the center and work your way out. Diesel: The Y385 25 HP 1500 cc Diesel engine required 125 ft-lbs of torque.

Generally speaking, cylinder head bolts are torqued in a series of passes, usually at least 3 from the condition of just tight to that of tightened to final torque, in an ever-increasing circular pattern from the center outward toward each end.

If the bolts show any signs of deformation, such as stretching, corrosion, or uneven surfaces, it's generally advisable to replace them. 3. Torque specifications: Head bolts are typically designed to be used only once, as they are often designed to stretch during installation to create the proper clamping force.