COMP Cams 54021 Billet Adjustable Belt Tensioner w/ Idler for GM LS Engines

Regular price: $224.95
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Sale price: $224.95

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In Stock: 12

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Product Specification:

SKU:CCA54021

MPN: 54021

UPC: 036584189848

Weight: 1.4 lb

Inventory: 12

Type: Belts - Timing, Accessory

Vehicle Fitment

GM LS-series V8 (Gen III / Gen IV) - e.g., LS1, LS2, LS3, LS6, LS7
Passenger car applications (does not support certain truck applications per COMP spec)

Features

Billet aluminum housing for lightweight yet robust construction
Adjustable, non-spring-loaded tensioner to control belt resonance
Integrated idler pulley to guide the serpentine belt
Black anodized finish for corrosion resistance
Higher lip design to help prevent belt slip
Fully adjustable to suit high-performance or modified LS setups
Helps stop the throwing of serpentine belts in high-RPM or aftermarket balancer setups
Bolt-on installation - no major modifications required

Specifications

Part Number: 54021
Material: Billet aluminum body
Finish: Black anodized
Belt Type: 6-rib serpentine
Weight: ~1.23 lb (per AutoZone spec)
Adjustment: Manual, non-spring-loaded

Included Components

1x billet belt tensioner with idler pulley

Product Description

The COMP Cams 54021 is a high-quality billet belt tensioner with an integrated idler pulley, designed for GM LS-series V8 engines (Gen III/IV). This adjustable tensioner replaces the factory spring-loaded unit, allowing you to precisely control belt tension and reduce the risk of belt throwing - especially in high-RPM or performance builds.

Constructed from billet aluminum and finished with black anodization, the 54021 offers durability and a clean, race-ready look. Its fully adjustable design provides flexibility in tuning the belt drive system for different setups, while the higher lip and idler help maintain correct alignment under load. It's a bolt-on upgrade that helps enhance reliability and performance in demanding LS applications.