COMP Cams Performance Series Solid/Mechanical Lifters With EDM Injection Technology are premium lifters designed specifically for high-end street and race applications. Built to extreme precision tolerances to create the most durable solid lifters available, Performance Series Lifters are engineered to handle elevated, race application valve spring pressures. The .012" EDM oil hole in the lifter face increases oil flow to the camshaft lobe contact point. This lifter is very lightweight with no chamfer. This is a universal design for engines which accept .875" diameter lifters.