Those are 5/16ths NC, so I would go about 45. Also, remember to use Loc-tite on them.
torque specs 350 Chevy heads65 lbs
yes
35ft. lbs.
45 lbs.
45 Lb/ft Below is a link to all small block Chevy torque specs.
35 ft. lbs.
65ft. LBS.
35 ft. lbs.
65 ft-lbs
A lot of manufacturers use a torque setting, but not Chevy. With the motor running, go to zero lash, and then 1/2, to a full turn from there.
The 400 Chevy small block motor should have approximately 390 horse power. It should have 427 foot pounds of torque.
160 foot lbs