Irwin tools make a socket set for use on damaged and rounded heads.Try that first.
If they don't go,cut the bolts off(grinder,torch etc),remove manifold and use the candle wax trick:
Being the 6.0 has aluminum heads,heat the stud with oxy/acetylene torch 'til red hot,then take a candle and melt it by holding at base of stud 'til it stops smoking and melting.When cooling,the wax will pull into threads of stud.Put vise grip on stud and turn it out.Never failed me yet.
Did it on a '01 Silverado 6.0 and a 98 Expedition 5.8 both with aluminum heads.Takes a little practice.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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