For those thinking that only 5 lb/ft (60 lb/in) is not much, that amount of torque on a dry 3/16" stud will create a clamping force of about 1,500 pounds.
With 4 studs in each block, the total clamping load on the block will be over 6,000 pounds !!!
That's more than enough to resist the pressure from the valve spring and any inertia that might be involved with the moving parts.