COMP Cams 99958X-2 Race XD Hydraulic Roller Lifter Pair .904 LS Bronze Bushing REM Finish

The COMP Cams 99958X-2 Race XD hydraulic roller lifters are engineered for high-performance GM LS engine builds demanding superior valvetrain durability and precision. Sold as a pair, these .904-inch diameter lifters feature a bronze bushing construction and a REM isotropic superfinish on critical wear surfaces, dramatically reducing friction and improving oil retention for extended component life under high-RPM and high-lift camshaft applications.

The Race XD platform is specifically developed for aggressive street/strip and race applications where stock or standard-performance lifters fall short. The REM finishing process creates a microscopically smooth surface that outperforms conventional ground finishes, reducing heat and wear during demanding duty cycles. These lifters are supplied without valve seats, making them ideal for use in applications where seats are already present or custom configurations are required.

Key Features:

• .904-inch body diameter — direct fitment for GM LS engine families
• Bronze bushing construction for enhanced durability and wear resistance
• REM isotropic superfinish on wear surfaces for reduced friction and extended lifter life
• Race XD design — built for aggressive cam profiles and high-RPM operation
• No valve seats included — configure for your specific application
• Sold as a pair (2 lifters)
• Designed for GM LS-series engines

COMP Cams is a leading manufacturer of performance valvetrain components, and the Race XD lifter series represents their commitment to precision engineering for serious performance builds. These lifters are an excellent choice for LS-based engine builds running aggressive hydraulic roller camshaft profiles.