455 exhaust manifold torque spec needed

What's the torque spec requirement for exhaust manifolds on a 71 455 engine? I don't want to over tighten them.

Thanks,

Mike
NJ

 

3/8" course bolt , about 30-35 foot-lbs should do it :TU:

 

I make them tight. Then I tighten them again after the engine gets hot.

 

Thanks guys.

Mike
NJ

 

u should check the bolts several times, over a period of time, to sure. it dows take awhile for tha gaskets to set, if u used gaskets. also, use a little anti-seize on the bolts.