New hydraulic lifter for original 1971-1975 Opel 1.9L engines. A set of eight (8) new lifters is required, whenever a new hydraulic-grind camshaft is installed into a cylinder head. Can also be installed into other 1.9, 2.0, 2.2 and 2.4 Opel CIH cylinder heads, when they are equipped with a hydraulic-grind camshaft. (Notes: Refer to OGTS tech notes for proper installation, adjustment and initial engine break-in procedures. Also see our part #6087 cam oil dam and part #6170 camshaft break-in additive).