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

Lifter pump-up happens when the hydraulic lifter's internal oil pressure causes it to over-extend at high RPMs. This can lead to valve float and reduced performance. The Pro-Mag lifters have a unique internal design that properly positions the piston at higher speeds, preventing this harmful over-extension.

Do these lifters come with everything needed for installation?

This set includes the 16 Pro-Mag hydraulic lifters. You will need an adjustable valvetrain to properly set the pre-load, which is crucial for their correct operation.

What is the recommended pre-load for these lifters?

The manufacturer recommends a pre-load of .002" to .004" with the engine warm. This setting is critical for the proper function of these hydraulic lifters.

COMP Cams Hydraulic Lifters 867-16 - AMC/Chrysler V8

Name: COMP Cams Pro-Mag Hydr Lifters AMC MT
Brand: COMP Cams
Price: 361.40 USD
Availability: InStock

COMP Cams Pro-Mag Hydr Lifters AMC MT

$361.40

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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 Hydr Lifters for AMC/Chrysler V8. Designed for high RPM performance without pumping up.

Key Features

Fits a wide range of AMC V8 290-401 and Chrysler V8 273-360, 383-440 ('68+) engines.
Designed to perform at higher engine speeds without harmful 'pumping up'.
Internal piston positioning at higher RPM prevents lifter issues.
Yields a significant power increase over standard hydraulic lifters.
Features a .904" diameter and 1.84" seat height.
Requires an adjustable valvetrain for proper pre-load setting.

⚠️ 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

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Will this fit your vehicle?

Product Details

If you're rebuilding the valvetrain on your AMC V8 (290-401) or Chrysler small block (273-360) and big block (383-440, '68+), these COMP Cams Pro-Mag hydraulic lifters are a solid option. They're specifically built to handle higher engine speeds, which is crucial for getting the most out of your engine when you're pushing it hard.

What sets these apart is their internal design. It's engineered to keep the lifter piston in the correct position even when the engine is revving high. This prevents the common issue of lifters 'pumping up,' which can lead to inconsistent valve timing and reduced performance. The result is a notable power increase compared to standard hydraulic lifters, especially at higher RPMs. These lifters have a .904" diameter and a 1.84" seat height, and they require an adjustable valvetrain for proper pre-load setting of .002"-.004" with a warm engine.

These lifters fit a wide range of AMC and Chrysler V8 applications, making them a versatile choice for many classic builds. Ensure your valvetrain is set up for adjustability to take full advantage of what these lifters offer.