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im really confused. im running -30 (jdm b16 pistons) in a b18 block, and i dont know what ring sto buy. are all b series ring sthe same? or should i order rings to match the pistons? or rings to match the block?
They are all the same, but if you are going to be running an oversized piston, you need oversized rings. Otherwise, any B series 81mm bore rings will work.