If securing the stock cast iron head, the torque requirements for Chevrolet 350 cubic inch V8 head bolts are 65 foot-pounds per bolt. Manufacturers’ guidelines should be checked because aftermarket aluminium heads require specific torque settings.
It is required to constantly tighten Chevy 350 cylinder head bolts in a helical pattern, beginning with the centre bolt and moving outward in a clockwise spiral. To maintain consistent pressure across the head, it is advisable to initially tighten all the bolts to 25 foot-pounds, then 45 foot-pounds, and lastly 65 foot-pounds.
Additionally, any bolts that enter the water jacket should have sealant applied to them as well as engine oil or another lubricant to the bolts in blind holes.