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When I ordered a a few sets of rod bearings last year from VAC, I inquired about the mains as well as I have two very unique motor builds going together. i was told they are all "greens" which makes logical sense to me to pick the middle target.
I'm guessing in their mind if someone is looking for a higher performance bearing than OEM, the block and bedplate would line bored to spec anyway with a custom crank and clearance verified via bore gage and mic anyway.
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