What is the benefit of a 10 percent underdrive pulley?

A 10 percent underdrive pulley slightly slows down the accessories driven by the belt, like the A/C compressor. This reduces the parasitic drag on the engine, which can free up a small amount of horsepower and improve throttle response.

What does the 4-groove design mean?

The 4-groove design indicates that this pulley is intended for use with a serpentine belt system that has four ribs. This is common on many LS engine applications.

Does this pulley come with a new belt?

This pulley is sold individually and does not include a new serpentine belt. You may need a slightly longer belt depending on your specific accessory configuration after installing the underdrive pulley.

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Specifications

Brand: ATI
Part #: ATI916179
UPC: 800157053665

ATI Pulley - A/C - 4 Grv - 10 Percent UD LS1 LS6 5.5 Damper

Name: ATI Pulley - A/C - 4 Grv - 10 Percent UD LS1 LS6 5.5 Damper
Brand: ATI
SKU: ati-ati-pulley-a-c-4-grv-10-percent-ud-ls1-ls6-5-5-damper-t14-360719
Price: 107.52 USD
Availability: BackOrder

$107.52

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ATI 10 Percent Underdrive A/C pulley for LS1 and LS6 engines. Reduces accessory drag for improved performance.

Key Features

Fits LS1 and LS6 engines.
10 percent underdrive design reduces accessory drag.
5.5 inch diameter damper.
Features 4 grooves for serpentine belt systems.
Helps free up horsepower and improve engine responsiveness.

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About this part

Product Details

This is the ATI 10 Percent Underdrive A/C pulley, designed specifically for LS1 and LS6 engines. It's a 5.5-inch diameter damper with four grooves, intended to slightly slow down your air conditioning compressor. By reducing the load from the A/C system, you can free up a bit of horsepower and improve the overall responsiveness of your engine.

ATI is known for making well-built performance parts, and this pulley is no exception. The 10 percent underdrive is a popular choice because it offers a noticeable improvement in accessory drag without overworking the A/C compressor or causing issues with other belt-driven components. The 4-groove design means it's ready to work with a multi-rib serpentine belt setup, common on many LS applications. Installing this pulley is a straightforward way to get a little more out of your LS1 or LS6 engine.