BBC Retro-Fit Hyd Roller Lifters (Pair)

The BBC Retro-Fit Hyd Roller Lifters by COMP CAMS (Part No. 85401-2) are hydraulic roller lifters engineered for big block Chevy engines requiring a retrofit upgrade to modern roller technology. These lifters replace older flat-tappet designs, offering improved valve train stability and reduced wear. Designed for builders and engine shops modernizing classic big block Chevy platforms, this pair delivers the durability and precision needed for both street and performance builds.

Hydraulic roller lifters incorporate internal oil galleries and spring-loaded rollers that reduce friction compared to solid lifter designs, translating to lower parasitic drag and extended component life. The 0.842-inch outside diameter (OD) specification ensures compatibility with big block Chevy bores, while the link bar design provides synchronized lifter action across the valve train. COMP CAMS' hydraulic lifters automatically adjust for thermal expansion and valve lash via their internal compensator mechanism, eliminating the need for manual adjustment and maintaining consistent performance across varying engine temperatures and load conditions.

This pair is ideal for big block Chevy engine rebuilds and retroactive modernization projects where stock components are worn or damaged. Installation requires compatible cylinder heads, a matching camshaft ground for roller lifter geometry, and proper pushrod length to maintain correct valve train geometry. Verify your engine block type and valve cover clearance before purchase, as retrofit applications demand attention to pushrod travel and lifter bore condition. These lifters weigh approximately 0.67 lbs as a pair, making them a direct drop-in for qualifying big block applications.