should there be a significant difference in the bow of the cam tensioner between a 74 550k and a 76 550k? Or could one just be worn out. I left the pics at home I will bring tomorrow if this can not be answered quickly. I put the cases back together last night , on the 74 550, for the second time. all went well. I was looking at the two tensioners though and there was a big difference in them so I stopped.