For years, COMP Cams® Super Roller Lifters have set the standard for solid roller lifter technology. But today's engines place a greater demandon lifters, unlike ever before. With today's radical cam lobe designs and increased rpm ranges, it takes a superior roller lifter to withstand the abuse. In keeping with the heightened requirements, COMP Cams® has not only changed the name of this industry standard, but more importantly, enhanced its durability with a series of innovative upgrades. Most significant among the upgrades is the addition of EDM Oil Injection? technology, which ensures the bearing assembly receives a constant flow of pressurized oil. Unlike other lifters that offer pressurizedoiling only as an upgrade, EDM Oil Injection? technology is standard in every Endure-X? Solid Roller Lifter. This virtually eliminates needlebearing oil starvation, historically a "problem area" for solid roller lifters when used in low rpm and street applications. To further strengthen thebearing assembly, the Endure-X? Solid Roller Lifters also include needle rollers that are precision sorted by size, evenly distributing loads toavoid premature wear and failure. In addition to the new upgrades, all Endure-X? Solid Roller Lifters still contain the features that make them the ideal standard. Every lifter is fully heat-treated, machined to ultra-high tolerances and fully rebuildable. The COMP Cams® patented link bar assembly blends all the advantages of a removable link bar with the safety of a captured link bar. COMP Cams® Endure-X? Solid Roller Lifters are available for a variety of applications, including small base circle and off-set applications.Pit Stop USA offers Comp Cams Endure-X™ Solid Roller Lifters (16) Ford 289-351W 838-16 at low everyday prices. Be sure to check out all of our products from Comp Cams including Comp Cams Roller Lifters - Small Block Ford.