The torque specifications for Chevrolet 350 cubic inch V8 head bolts are 65 foot-pounds per bolt if securing the stock cast iron head. Aftermarket aluminium heads have unique torque settings, so manufacturers' guides should be consulted.
The tightening of Chevy 350 cylinder head bolts must always be done in a helical sequence, starting from the center bolt and working outwards in a clockwise spiral. It's best to first tighten all the bolts to 25 foot-pounds, then 45 foot-pounds and finally 65 foot-pounds to maintain uniform pressure across the head. In addition, engine oil or some other lubricant should be applied to the bolts in blind holes, and sealant should be applied to any bolts that penetrate the water jacket.