Crankcase Vent Breather PCV K&N 240Z 260Z 280ZNew K&N clamp on crankcase vent breather for Datsun 240Z, 260Z and 280Z 1970 78. This breather will clamp on to the steel tube that comes out of the block which is located under the intake exhaust manifold at the front of the engine. . Replaces the hose that runs up to the air cleaner. This breather will clamp onto 1" tubing. Breather is 2. 5" tall & 3" diameter. This K&N filter has a black rubber top. Some late 280Z's used a smaller 5 8" tube for the