The ridges Are where your pistons have worn down the cylinders itself, and not had enought travel to wear the ridge down. This is common in High mileage motors. They make a Cylinder Ridge Cutter to take care of it.
Technically it's where the "rings" stop traveling in the cylinder. Cutting tool is called a "Ridge reemer".
The pistons are tough to get out if this ridge is very pronounced.
This tool is expensive to purchase but you can rent it inexpensively for a one time deal.
69' SS396 Chevelle
M-21 Close Ratio
10 year Resto
It's brand new again!
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