Little late to the discussion but the early heads used 6 different bolt lengths.
Easy way to see if the heads are early is the 2 out bolt holes in the valve cover area are recessed way down in the head. Newer ones supposedly are about equal with rest of the holes. (haven't seen a newer style head though)
Getting a socket on that bolt (if nut it needs a smaller head).
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John Wallace - johnta1
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