bore guage

Are these accurate? Seems the diameter of the ends would prevent them from hitting the cylinder wall at the right angle >> (| << to see the entire diameter? Or would you measure across the opposites?
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I use those for checking ports.
They'll definitely work.
Jegs has a 100 dollar or so bore gauge that works great. That's what I use... but the snap gauges and a micrometer will do it, just takes longer...with the gauge you can just run up n down and see how tapered and oor it is.