Schucks sells these header bolts in the performance section they are made by several companies but they all have one thing in common....
they have an allen head in the center of the bolt so what you do is you bolt em in.. then you turn the allen head in the center of the bolt with expands in the center effectly expanding down in the center effectly locking the bolt !! now this is by no means a cure all . but
its similar to a poly lock on your rocker arms from time to time you have to go and tighten up the allen heads but thats a snap
these should deffently help your problem man and shouldnt hurt your wallet too much either :beer: :beer: