i need something settled once and for all. ive been asking questions in regards to my engine without the awareness that there was a difference in piston size between the JDM and the USDM.

i need to know the stock bore size of a JDM B18c1??

any help appreciated. as my parts are being sent out on friday to the engine shop. need to make sure i dont have to order new pistons.

 

81mm (3.189")