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Hagerty Employee

Measuring cylinder bores using a dial bore gauge | DIY | Hagerty Media

The secret to properly rebuilding an engine isn't really a secret at all; it's measurement. If you don't know what you have, you will never know what you need to do. This goes for almost all parts of an engine assembly, from bearings to bolt torque.

This is a bit beyond my wheelhouse, but two things came to mind watching this. First, how do you get any kind of precise measurement when rocking the top or anvil-side of the gauge puts the gauge out of perpendicular to the cylinder wall? If the gauge isn't perfectly perpendicular, the measurement will change. Which brings me to my second thought: cylinder bore measurement seems like a task ideally suited to a laser scanning device. I'm not sure if such a tool hasn't already been invented, but it seems like it could be a significant time-saver while also delivering a lot more accuracy.