Crower 84568S Features:

Crower 84568S mechanical roller lifter kit for 1955-1981 Pontiac V8 engines, fits 287, 301, 316, 341, 350, 370, 389, 400, 421, and 455 applications. Includes mechanical roller lifters 66294-16, valve springs 68369-16, retainers 87055M-16, and valve seals 86072-16 as a matched valvetrain component set. Engineered for high-performance and racing use, with valvetrain control designed to support severe engine speeds up to 7,500+ RPM. Recommended for Crower Ultra-Action Performance Level 5 mechanical roller camshafts, including 275R, 284R, and 294R grinds, for optimum performance.

Roller Lifter Kit Pontiac Mechanical Roller Kit 1955-1981 Pontiac Features:

• Complete mechanical roller valvetrain kit for 1955-1981 Pontiac V8 applications including 287, 301, 316, 341, 350, 370, 389, 400, 421, and 455 engines
• Includes matched mechanical roller lifters, valve springs, retainers, and valve seals for coordinated valvetrain setup and simplified parts selection
• Engineered for high-performance and racing use with valvetrain stability at severe engine speeds up to 7,500+ RPM
• Recommended for use with Ultra-Action Performance Level 5 mechanical roller camshafts for optimized performance and valvetrain longevity
• Supports non-adjustable pushrod setups with 0.050 in. off-the-snap-ring preload; verify clearances and not for 1.65:1 rocker-ratio heads