I had that same problem on #7 Exhaust. Put in second lifter and it started to rotate like 90 degrees but no more. After carefully looking at the sides of the two lifters that wouldn't rotate I noticed scratch marks up and down on sides of lifters. Very small scratches but noticable. Now lifters are like RC 56 which is hard compaired to the cast iron block, so it would take a lot to leave scratch marks. Felt lifter bore with my finger and could feel slight burr on bottom of lifter bore. Used some 240 sandpaper on a 3/4 wood dwl and hand cleaned the lifter bore, careful to trap all the grindings. Put in new lifter and re-broke in that one lifter. It doesn't take much to keep them from turning. Thats all it took to get mine rotating. But it cost 2 extra lifters.
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