Crower 84551H Features:

Fits Chevrolet Big Block 396-454 engines; Crower hydraulic roller kit part number 84551H. Includes HIPPO hydraulic roller lifters 66321H-16, valve springs 68340-16, retainers 87063M-16, and plugs 86086. HIPPO lifters use EDM-machined oil metering holes to feed high-pressure oil to the needle bearings and pins. Redesigned lifter body and crowned bearings help reduce lobe tracking and improve valvetrain durability.

Hydraulic Roller Kit Chev Big-block Chevy 396-454, Hippo Lifters, Features:

• Big-block Chevy 396-454 fitment with Crower HIPPO hydraulic roller lifters for direct retrofit valvetrain upgrade
• EDM-machined high-pressure pin oiling feeds bearings and pins continuously to reduce wear under high-rpm loads
• Redesigned lifter bodies with crowned bearings help improve lobe tracking and extend roller bearing cycle life
• Matched kit includes hydraulic roller lifters, valve springs, retainers, and plugs for coordinated valve control
• Ideal for hot street, nitrous, and supercharged builds needing hydraulic-lifter reliability with roller-cam performance