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The plater I use states their "bores are straight and round within ± .00025" ."
I don't disagree that used cylinders can be out of round. Hopefully, it's just the plating and not the cylinder itself. As with all things, if you start with crap...and you don't do anything to the crap but dress it up, you just end up with pretty crap after all the work.
The other thing I wonder about the QSC jugs is the metallurgy. I don't need to tell Henry, but there are some folks out there who think that all "Nikasil cylinders" are the same. Nikasil is just the plating on the bore.
Don't get me wrong, I am always looking for low cost alternatives that don't compromise on the engineering. I have a couple of hi-po engines in the works, and if I can get a better solution (cost, material and quality) than boring and plating stock jugs, I'll be all over it, but I'm too particular. I must satisfy that little voice in my head.
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