Belt Tensioner w/Idler Pulley - GM LS Engines

The COMP CAMS Belt Tensioner with Idler Pulley for GM LS Engines is a precision-engineered serpentine belt tensioner assembly designed to maintain optimal belt tension and prevent slippage across the accessory drive system. Built from aluminum and finished in black anodized coating, this tensioner delivers reliable performance for LS-series engine swaps, crate engine installations, and high-performance LS builds where OEM belt routing and tension control are critical to engine longevity and accessory function.

Aluminum construction with black anodized finish resists corrosion while minimizing weight—a practical advantage in engine bay environments where thermal cycling and humidity accelerate rust formation on untreated steel. The integrated idler pulley design eliminates the need for a separate pulley, reducing component count and simplifying installation on LS engine platforms. Proper belt tension is essential for alternator output stability, power steering pump flow, water pump cooling efficiency, and air conditioning compressor function; undersized or incorrect tensioners cause belt slip, voltage drop, and potential accessory system failure under load.

This tensioner is purpose-built for LS engine platforms including traditional naturally aspirated builds, turbo LS conversions, and supercharged LS applications where accessory belt demand is highest. Enthusiasts performing LS engine swaps into Camaros, Corvettes, trucks, and custom hot rods rely on quality tensioners to ensure the serpentine belt system performs consistently without chirping, slipping, or bearing wear. The black anodized aluminum finish integrates seamlessly with modern engine bay aesthetics while providing corrosion protection in salt spray environments and high-humidity storage conditions.