If securing the stock cast iron head, the torque specifications for Chevrolet 350 cubic inch V8 head bolts are 65 foot-pounds per bolt. The torque settings for aftermarket aluminium cylinder heads are unique, thus the manufacturer’s instructions should be consulted.
Chevy 350 cylinder head bolts must always be tightened in a helical pattern, beginning with the central bolt and working outwards in a clockwise spiral. To ensure uniform pressure across the head, it is recommended to initially tighten all the bolts to 25 foot-pounds, then 45 foot-pounds, and lastly 65 foot-pounds. In addition, engine oil or another lubricant should be applied to blind-hole bolts, and sealant should be applied to bolts that pierce the water jacket.