Here’s a link to a discussion about header studs and nuts.http://board.marlincrawler.com/index.php?topic=102688.msg1149909#msg1149909
Everyone’s experience can be different… here’s mine.
I use Red Loctite on the threads into the head. Red Loctite will set up in about 10 minutes and cures in 24 hours. It has a spec'd temp range to about 500d F.
The Red Loctite also acts as a sealer to help reduce the powdering and corrosion that occurs between the alloy head and the steel studs due the difference in thermal expansion.
The short length threads on stud go into the head. I am careful NOT to over-torque the studs in the head… maybe 10 to 15 lbs.
I use anti-seize compound on the manifold or header threads. I DO NOT use the factory exhaust manifold nuts! They self-clamp and will cause the stud to spin inside the head when tightening or removing them. I use a lock washer and standard hex nut, and after they take a set, I use a lock nut.
I check and carefully re-torque the nuts until they take a set and remain tight. This may take several days to several weeks in my daily driver.
I would not recommend “staking” the nut.
That’s just my opinion – it may be worthless.