Not Ranked
Rings,
They start out with nice sharp corners and a rectangular cross section. After scrubbing up and down in a bore a bunch of times, the corner rounds off a bit. They do have a little bit of rocker action in the ring lands. Modern rings already have the bevel from the start.
That's the way it was explained to me, but go ahead and ask the pro's that make piston rings, I would be content to hear what they say happens to piston rings during "break in" from a more qualified source.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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