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I wouldn't say virtually zero - it was nearly 0.1mm, so coke can thick. We're not exactly talking microns here...
Regardless, there's a number that the valve lift can't exceed. It was exceeded.
I also disagree with the comments regarding the measuring itself. Remember they weren't measuring an ID or an outside length, they were measuring a range. It's a lot harder to get bad readings when you zero a dial and "measure" how far the dial moves from zero.
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