| RE: header bolt torque specs|
Exact torque spec isn't that important, as it's almost impossible to get a torque wrench on each and every bolt. Use a little bit anti-seize, and use the same wrench on each bolt. Your goal is to get them fairly tight, but not gorilla tight. Most importantly, you want them pretty much the same across the board. So use the same wrench and go by feel. Not very scientific, but works for me.
If you use Grade 8 brand bolt (highly recommended) then you'll get a spring washer which will maintain proper torque for you.