Cylinder hone for 5.9

HankRearden said

I need to buy a ball hone for the 5.9 I'm working on. DO I need to buy a 4" or 4 1/8"? Also what grit?

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The hones are sized a hair bigger for the bore size they're intended.
So 4" is good.
280 to 320 grit 400 for round holes and good rings.