piston pitting

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I think that pitting is bad enough, if you try to remove material to the point of making that smooth, you will be making measurable changes to the chamber volume and the piston weight.
 
Scrap that one and others like it. Piston lands are gone in places as well. The cir-clip is also bent out of shape. Even some good second hand ones would be a better option if your budget is tight. What do the cylinders look like?
 
I would replace the pistons. I would then look for a nice forged aluminum piston. Not racing pistons as you will find they are not as durable for many thousands of miles of street driving. Unless you have non-ethanol gasoline with over 90 octane I suggest going for 9.5:1 compression, as opposed to 10:1 or higher. This means a balancing of the engine is called for. Before putting much into the engine rebuild I would want to identify the cause of that pitting.
 
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