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Message: [QUOTE="8ad-f85, post: 186196, member: 4294"] To check between centers, you would need to know if it been ground in a machine located off the chamfers. The grinder's chucks often locate off the OD surfaces. Not sure if you could easily clamp one into a lathe and tell the differences described above. It's a bit of work getting the chucks and centers indicated in and you might still find deviations based on the grinding machine not using the same methods. Besides, the rod journals are ground first because it moves the crank around some....the mains should be close to perfect being ground last and the finished dimension crept up on. Looser clearances hide many evils :D It does kind of suck to have to pre-engineer solutions for potential errors or incompetency ??? Another issue using V blocks supporting 1 and 5 is if there was a grinding problem as described earlier you might not isolate that. You would still need to check 1 and 4. [/QUOTE]