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Thanks for the pics Dan. I helped a friend swap a 7.3 one time and its wasn't that bad. But he did have every tool we needed, thats aways a plus. Good luck and we cant wait to hear the start up story.
In case your still wondering why the clutch friction material is smaller than stock, I'll tell you a trick some companies do to increase their rated holding power. Decreasing the friction area increases the load on the remaining material (psi) without having to increase the pressure plate spring rates. This effectively makes the clutch grab harder, and it's the whole idea behind pucked and segmented clutches. It reduces wear time though.
I'm not saying it's whats going on here, as most manufacturers chose to segment the material before swapping in one of the wrong size. I'm thinking it's just the wrong part. The pilot bearing is interesting....