Set of 8, original Leyland ST product but now made for us to our specification. Critical to the life and performance of the camshaft use high quality cam followers. Remember, they operate in a finite hole and thus the dimensional tolerances are important so always check the follower in the hole for smooth movement. The race engine builder will always take the time to hone out the lifter bore to ensure maximum performance. In addition to the concentricity of the bore it is important to have the correct conical shape on bottom of the lifter (this promotes proper rotation of the lifter in the bore). And the final characteristic, weight, is often over-looked. In addition, these lifters have an oil drain hole, thus preventing a few grams of oil from collecting. This weight saving translates into better control, higher potential RPM, longer life, etc.