COMP Cams Evolution Hydraulic Roller Lifters for 1958-1965 Chevy 348/409 - 89591-16

COMP Cams 89591-16 Evolution Retro-Fit Hydraulic Roller Lifters are designed for 1958-1965 Chevrolet 348 and 409 Big Block W engines and are sold as a complete set of 16. These 0.842-inch diameter link-bar hydraulic roller lifters use COMP Cams' patented Hydraulic Cartridge Technology (HCT), combining a self-contained hydraulic cartridge with reduced internal oil volume to help maintain consistent bleed rates and responsive hydraulic operation. Their tall-body design allows use in both standard blocks and tall lifter-bore aftermarket blocks, making them suitable for retrofitting early engines originally equipped with flat tappet camshafts.

Key Features & Specs:

• Brand: COMP Cams
• Series: Evolution
• Lifter Type: Retro-Fit Link Bar Hydraulic Roller
• Lifter Style: Hydraulic Roller
• Quantity: Set of 16
• Technology: Hydraulic Cartridge Technology (HCT)
• Retainment: Link Bar
• Link Bars Included: Yes
• Link Bar Type: Vertical
• Lifter Body Diameter: 0.842 in.
• Lifter Seat Height: 2.475 in.
• Lifter Overall Height: 3.23 in.
• Lifter Travel: 0.150 in.
• Lifter Wheel Diameter: 0.700 in.
• Roller Type: Needle Bearing
• Lifter Seat Cup Diameter: 0.3125 in.
• Recommended Preload: 0.100 in.
• Lifter Offset: None
• Lifter Finish: As Ground
• Oil Band Top: 1.42 in.
• Oil Band Bottom: 0.93 in.
• Link Bar Bottom: 2.59 in.
• Pushrod Seat Offset: N/A
• Retrofit Application: Early blocks originally equipped with flat tappet camshafts
• Block Compatibility: Tall body fits standard blocks and tall lifter-bore aftermarket blocks
• Serviceability: Hydraulic cartridge element is serviceable
• Warranty: 12 months
• UPC: 036584417415
• Manufacturer Part Number: 89591-16
• SKU: CCA89591-16

COMP Cams Evolution HCT lifters use a thick-wall lifter body and compact hydraulic cartridge to reduce internal oil volume and limit the effects of oil aeration. The cartridge design is intended to provide consistent hydraulic bleed-down characteristics while increasing lifter body stiffness and reducing distortion. The precision-controlled bleed rate also helps reduce startup noise while supporting stable hydraulic operation at higher engine speeds.

The Evolution design also features a serviceable hydraulic element, allowing the internal cartridge to be rebuilt rather than requiring replacement of the complete lifter. These retro-fit lifters are specifically intended for converting compatible Chevrolet 348/409 W-series engines from their original flat tappet configuration to a hydraulic roller lifter setup.

Fitment:

• 1958-1965 Chevrolet 348 Big Block W
• 1958-1965 Chevrolet 409 Big Block W