What is 'lifter pump-up' and how do these lifters prevent it?

Lifter pump-up happens when the internal oil pressure in a hydraulic lifter exceeds its capacity at high RPMs, causing it to expand and hold a valve open slightly. These Pro Magnum lifters have a unique design that properly positions the internal piston at higher speeds, preventing this harmful condition and ensuring consistent valve operation.

What is the recommended pre-load for these lifters?

The manufacturer recommends setting the pre-load between .002" and .004" with the engine warm. This ensures the lifters are properly adjusted for optimal performance and longevity.

Do these lifters come with everything needed for installation?

This listing is for a set of 16 Pro Magnum hydraulic lifters. You will need to ensure you have an adjustable valve train setup, as specified by the manufacturer, for proper installation and tuning.

COMP Cams Hydraulic Lifters Pro-Mag 858-16 for Chevy SB

Name: COMP Cams Pro-Mag Hydr Lifters Chevy SB
Brand: COMP Cams
Price: 316.99 USD
Availability: InStock

COMP Cams Pro-Mag Hydr Lifters Chevy SB

$316.99

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams Pro-Mag Hydraulic Lifters for Chevy SB V8 engines. Designed for high RPM performance without harmful pumping up.

Key Features

Fits a wide range of Chevrolet Small Block V8 (265-400), Big Block V8 (396-454), and 348-409 engines.
Designed to perform at higher engine speeds without harmful 'pumping up'.
Unique internal piston positioning prevents lifter issues at high RPM.
Yields a significant power increase over standard hydraulic lifters.
Requires an adjustable valve train for proper setup.
Features a .842" diameter and 99g weight.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

If you're rebuilding the top end of your small block or big block Chevrolet engine and want to push it harder, these Pro Magnum hydraulic lifters from COMP Cams are a solid option. They're built to handle higher engine speeds, which is crucial when you're aiming for more power and better performance. Standard hydraulic lifters can sometimes 'pump up' at higher RPMs, leading to issues, but the unique design of these Pro Magnums keeps the internal piston in the correct position to prevent that harmful condition.

This means you get a more consistent valve train operation when you're really winding the engine out. COMP Cams has engineered these to offer a notable power increase over typical hydraulic lifters, especially when paired with an adjustable valve train setup. The manufacturer recommends a pre-load of .002" to .004" with the engine warm, so keep that in mind during installation. They fit a wide range of Chevrolet V8s, including popular models like the Camaro, Corvette, and C1500 trucks.