i just got some new pistons that are .25mm overbore for my b18b1 and i need to know what i need to have to the block bored to, just to be sure. i know it seems like a stupid question but i just want to make sure im doing it right. thanks

 

Yes, your block will need to be bored out to the proper size for your piston to fit.

 

81 + .25=???lol...