ye that is pretty normal. one of my cores runs about 15 degrees F (took me a while to realise you were talking in F not C!!) hotter than others as well.
whats it like at load? at load (gaming) in most games the temps are much more even i find.
I ran prime 95 maxed out temps were all within 3 degrees, highest was 64c. The fans were whizzing louder than I have ever heard before playing any games so I think all is good thanks. It had me worried for a while.