Hi sk8erade, and welcome to the forum,
I personally have not come across damage like this before, so it's either an imperfection in the casting process or water has been sitting in the bottom of the bore and caused it to corrode.
Cheers, Ted

Entire Thread
Subject	Posted By	Posted
GXV140 damaged cylinder bore	sk8erade	07/01/18 02:41 AM
Re: GXV140 damaged cylinder bore	bigted	07/01/18 02:34 PM
Re: GXV140 damaged cylinder bore	AVB	07/01/18 04:38 PM
Re: GXV140 damaged cylinder bore	sk8erade	08/01/18 03:42 AM

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