These new higher RPM factory hydraulic roller lifters were developed for the Cadillac CTS-VR racing program and allow better valve control at higher RPM's up to 8,000 - 8,500 RPM. The CTS-VR hydraulic roller lifters have a ceramic check ball and are often referred to as the ceramic check ball lifters. These are a direct replacement for all LS1, LS2, LS3, and LS6. LS7 engines. These Chevrolet Performance hydraulic roller lifters are designed as direct replacements for your engine. These lifters were designed for use by GM to be used in performance engine builds and incorporate improved valving to allow higher rpm capability- what more can you ask for? Sold as a set of 16 lifters. Needs to Scuff bowtie logo and Black Oxide finish off top of push rod cap to “Look Stock” with scuffy pad.