How many locations should the bores be measured?

Measuring the bores in three different locations is essential for obtaining an accurate assessment of the cylinder's condition. This method helps to ensure that any wear, taper, or out-of-round conditions can be identified effectively. By staying off the parting line by 10-20 degrees, the measurements are less influenced by any imperfections or variations that might exist at the parting line.

Taking measurements at multiple points provides a more comprehensive view of the bore's geometry and surface condition. If only one measurement were taken, it might not reveal potential issues such as uneven wear or misalignment that could affect engine performance. Thus, measuring in three distinct places allows for a more reliable evaluation of the bore's overall health and suitability for re-honing or oversized piston installation.