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Iron heads have a hell of a time stripping rocker bolts. Is your 3400 02 or newer? Some 02 and all 03+ are 8mm rockers, which have more problems than the 10mm used in previous years. I have read a different torque procedure that has your turn the crank so that whatever rocker you are torquing down has the cam on the base lobe (no lift). This way you aren't going against the valve spring pressure.
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