LB7: stock bore size

[02ilduramax]

this seems like a very simple question and I almost feel dumb asking but what is the duramax stock bore size is it 4.055 or is it 4.60 ive seen+ .020 pistons for sale that are advertised 4.075 and 4.080 so im just trying to figure out which one it is

 

[IOWA LLY]

4.055.

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[02ilduramax]

and idea why some companies claim their .020 over pistons are for a 4.080 bore?

 

[IOWA LLY]

I'm only guessing since you haven't said what companies or whether the pistons in question are forged or not, but maybe they are wanting the extra clearance. (Forged)

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[02ilduramax]

one I coca think of is diamond and clearance should be factored in to the piston not your final honed size