COMP Cams Solid/Mechanical Lifters are manufactured using the tightest tolerances in the industry to ensure peak performance in all applications. The crown of the lifter is ground to a precise radius for proper break-in and optimum durability, which guarantees a long life. The oil metering band is milled to an exact depth in order to prevent too much oil from being delivered to the top of the motor, robbing precious horsepower. The lifter is the most important component between the cam profile and the valve and have maximum power and **protection.