I'll second the over-adjusted theory.
Sounds to me that there's just enough heat expansion going on the cause the bind.
Try backing them off a tad and see what happens.


1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.