Crower 84505 Features:

Crower 84505 roller lifter kit for Chevy 396-454 Big Block engines with dual valve spring configuration. Includes roller lifters 66291-16, dual springs 68806-16, retainers 86780-16, and seals/locks 86069-16. Engineered for aggressive camshaft profiles and maximum engine speeds up to 8,000 rpm. Valve springs deliver 279 lb seat pressure at 2.000 in., 733 lb nose pressure at 1.250 in., coil bind 1.160 in.

Roller Lifter Kit Chevy 3 Big Block 396-454 Dual Features:

• Big-block Chevy 396-454 roller lifter kit for dual-spring valvetrains, engineered for aggressive cam profiles and high-rpm stability
• Complete kit with roller lifters, dual valve springs, retainers, and matching seals and locks for streamlined valvetrain setup
• Supports engine speeds up to 8,000 RPM with dual springs rated at 279 lb seat pressure at 2.000 in. for precise valve control
• High-load spring performance with 733 lb nose pressure at 1.250 in. and 1.160 in. coil bind for demanding big-block applications
• Requires Super 7-degree keepers, optimized for Chevy 396-454 big-block engines using performance-focused dual-spring combinations