My experience with header bolts is that you need a combination of sockets and wrenches to get to the bolts. You will have to go at some of them from the top and some from the bottom. 12 point closed end wrench should work as well. By the way, what gasket are you using? Is it paper of factory metal backed? Header bolts also require constant tightening; less after the first month. But I checked mine daily for a week, then weekely for a while. Now they have set in and I check them about once every 4-5 months.
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