Is this bad or good for my engine build?

[captain_kurt]

So I have been going through the process of doing an engine build process. And while I was honing the first cylinder and cleaning it, I found a slightly rough ring inside the cylinder walls.it has a discolored ring in the pictures. Will this affect my compression or does this require me to overbore the cylinder? Is it possible that I will be fine with just honing it?

 

[BogusSVO]

Depends on how long you want the new rings to last.

You may be able to pop some new rings in there and get a few miles before that rough patch grinds the compression rings.

Looks like water sat on top of the piston and the rings rusted to the cylinder bore.

Personally, I would bore the block and start with a round straight bore.

 

[boosted97RS]

Personally I would overbore it to be on the safe side.

 

[captain_kurt]

Yea I was thinking of over boring it just to be on the safe side. What size overbore would be good? I called the machine shop and they said that they need the rods and pistons to over bore it. Is this true or can I tell them to overbore it a certain size?

 

[Kirkamus]

You would want them to size match your pistons to your bore to create the tightest seal.

 

[WES_393]

Yea I was thinking of over boring it just to be on the safe side. What size overbore would be good? I called the machine shop and they said that they need the rods and pistons to over bore it. Is this true or can I tell them to overbore it a certain size?

You want to bore the cylinder as little as possible while still removing the damage. They do need the pistons in order to set the piston-to-wall clearance when honing, but I don't see how they can expect you to buy pistons when they don't even know what size they're going to need to bore the holes. What if you buy a set of 85.5mm Manley pistons and the block has already been bored once and needs to go 86mm? Then your $500 pistons are really nice paperweights. And they don't need the rods to bore the cylinders, thats just nonsense.

In short, find another shop.