Though I don't know the specific torque ft/lbs. that you'd have to get those bolts down to... before my rebuild, I was running a set of Hooker Unequal Length Headers. Now, I tell you, no matter how much I attempted to torque those things down to spec, they'd always get pushed back out over time.
I would recommend picking up a set of ARP Header Bolts, some Thread Locker (Highest Temperature Rating), and a set of Copper Head Gaskets. Place all of those in and torque them down. It should fix the problem of your bolts backing out.
I just installed some BBK LT's this weekend and I torqued them in two stages. I worked from the inside out to 15-18 and then 20-24 pounds. I heard something similar to this somewhere and it has worked so far. For the bolts I used Stage 8 with the locking rings and haven't had a problem so far.
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