The Melling 291012 High Performance Hydraulic Retro-Fit Roller Lifter Set is engineered for 1955-1981 Oldsmobile (260-455 ci) and Pontiac (265-455 ci) V8 engines originally equipped with flat tappet camshafts. This set converts factory non-roller blocks to hydraulic roller operation using vertical link bar-style lifters, reducing valvetrain friction and unlocking the ability to run more aggressive roller camshaft profiles for serious street and performance builds.

Melling 291012 High Performance Hydraulic Retro-Fit Roller Lifter Set Features:

• Fits 1955-1981 Oldsmobile V8 260-455 ci and Pontiac V8 265-455 ci engines
• Retro-fit design for blocks originally equipped with flat tappet camshafts
• Converts engine to hydraulic roller lifter operation
• O.D.: 0.825 in. | Length: 2.632 in.
• Vertical link bar style for proper lifter alignment
• 100% select-fit components for precise leak-down rate
• 100% flow-checked machined steel pushrod socket for precise oil metering
• Hardened/tempered certified 52100 steel bearing assembly
• Reduces valvetrain friction for improved performance and longevity
• Accepts more aggressive cam profiles than flat tappet lifters allow
• Different length pushrods may be required after installation
• Sold as a Set