COMP Cams 85301-12 Evolution Retro-Fit Hydraulic Roller Lifters Small Block Chevy

The COMP Cams 85301-12 Evolution Series Retro-Fit Hydraulic Roller Lifters represent a premium upgrade for 265-400 cubic inch Chevrolet Small Block engines. Designed specifically for early model blocks originally equipped with flat tappet camshafts, these lifters enable roller cam conversions while delivering superior performance and longevity.

Key Features:

• Patented HCT (Hydraulic Cartridge Technology) design delivers consistent performance and reduced startup noise
• 0.842 inch outside diameter with link bar design for proper lifter orientation
• 2.475 inch lifter seat height with 3.23 inch overall height for proper valvetrain geometry
• Serviceable cartridge design allows in-garage rebuilding, extending lifter life
• Precision-controlled bleed down rate ensures excellent high RPM performance
• Incredibly stiff lifter body reduces distortion for consistent hydraulic performance
• Tall body fits both standard blocks and tall lifter bore aftermarket blocks
• As-ground finish for optimal cam lobe contact and break-in

The Evolution Series represents a breakthrough in hydraulic roller lifter technology, offering the most consistent, highest performing, and quietest operation available. The advanced cartridge design and proprietary manufacturing processes ensure precision and longevity that exceed competitive lifters. These lifters are engineered to handle aggressive cam profiles while maintaining reliable operation for street and performance applications.