I am doing a rebuilt on a B18b motor. I pulled the motor apart and notice the markings on the stock pistons. It has stamped .75 on the top of the pistons. I have not yet used a caliper to offically check the piston size, but could this me that the cylinders were bore .75mm over? And if so, I thought that Oem pistons were only .25mm over. Help me out.

 

Oem oversize includes .25 and .50.

 

sure they don't say P75 on them?