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220 in-lbs
Get the model # and click the link I will post.
160 inch/pounds
It depends on when the engine was made. It also depends on if it is flat head or overhead valve engine. If it is a flathead it torques to 15 foot pounds. Tighten in a crisscross pattern. If it is not an 8 hp flathead click the link and look up your model.
The Vanguard series is rated at 6.5 HP. Most small engines these days are no longer rated by HP but, rather torque. Several models of Briggs 205cc engines are rated at either 8 or 9 ft/lbs of torque. I can also add that the "Intek" and "Polar Force" series of the 205cc class are rated at 9 ft/lbs torque and 7.5 HP.
220 in. lbs.
Cylinder Head Torque is 190 inch pounds or 22.0nm
122inch lb
185 in/lbs. or 15.5 ft/lbs.
5/16 bolts 25 ft/lb
The torque sequence for a single cylinder Briggs and Stratton engine horizontal shaft head is increments of 2's for hp and 1's for head bolts. That makes 11 head bolts for an 18 hp.
Valves 21 hp Briggs and Stratton Intek V Twin can be adjusted by increasing the torque on screw band with a right rotation. This can eliminate some leaking problems.