Not aware of a torque rating however a bit of common sense applies here. These "acorn' nuts can only be screwed on so far being closed end nuts. Also when tightening these nuts you are compressing a rubber gasket. In practical terms when it begins to feel tight it probably is and you need to stop. If there IS a torque spec for those nuts it will be expressed in inch pounds. That's a SMALL amount of tightening.

4 ft-lbs (maybe 14) be careful if you break the weak aluminum walls of the valve cover dished area, JB weld won't help you maintain vacuum, and you will spend a year in the Junkyards looking for a new one like me.

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