How much should you resize over the standard bore size?

Resizing the bore size is a crucial step in ensuring optimal engine performance. The recommendation to resize by .010" is often based on balancing the need for sufficient clearance and the ability to maintain structural integrity.

When a standard bore is resized, it's essential to ensure that there is enough clearance for the piston to move freely while also allowing for proper lubrication and thermal expansion. A change of .010" typically strikes a good balance, providing enough room for different operating conditions without compromising the mechanical properties of the cylinder walls.

Increasing the bore size more than .010" can lead to various issues, including excessive wear, possible loss of compression, and heat management challenges. Resize amounts larger than .010", such as .020" or .030", may not be practical in many situations, as they can weaken the cylinder walls and potentially lead to failures due to increased stress. Therefore, resizing to .010" is generally considered a good practice for maintaining engine performance and longevity.