I'm building LS Vtec and using CTR pistons, which are only .25 over. Was wondering if anyone knew what the part number for the rings i need are. I have a NIB set of OEM LS rings and dont think they will work.

Can someone enlighten me, much appreciated.

 

No, the LS rings will not work unless they are also overbore. I think all piston rings are the same part number, just different sizes depending on the diameter of the piston.