the L20B is nothing more than the normal 4cyl L20 found in 200B and Bluebird. Dodgemean is just being pedantic, as he likes to do with any diff topic that comes up. The 6cyl L20A, to be perfectly accurate, was never released here, so its perfectly normal for people to just refer to the 4cyl L20B as a plain old L20. In fact if you walk into a Nissan parts department and ask for an L20 piston, I guarantee you will get a 4cyl L20B piston, not an 6cyl L20A piston.