ATI Damper - 6.78in - Alum - 6 Grv - 10 Percent UD - LS1/LS2 - F/V Body - 25T 8mm HTD Drive On Rear

This ATI crankshaft damper measures 6.78 inches in diameter and is constructed from aluminum. It features six grooves for accessory belts and is designed with a 10 percent underdrive pulley ratio, meaning your accessories will spin 10% slower than the crankshaft. This specific damper is built for LS1 and LS2 engines, particularly those found in F-body and V-body vehicles, and utilizes a 25-tooth, 8mm HTD drive on the rear.

The aluminum construction helps keep overall weight down, which can be important in performance applications. The 10% underdrive is a common choice for street-driven vehicles that still see occasional track use, as it reduces accessory load and parasitic drag on the engine without significantly impacting the functionality of accessories like the alternator or water pump. The 6-groove design allows for multiple accessory belt configurations, offering flexibility for various setups. The 8mm HTD belt drive system is known for its positive engagement and ability to handle higher torque loads compared to V-belts.

When installing this damper, ensure you have the correct tools for crankshaft pulley removal and installation, as well as a way to properly align the damper to the crankshaft snout. It’s crucial to follow the manufacturer’s recommended installation procedure to ensure proper function and longevity. This damper is a solid choice for LS engine builds where reliable accessory drive and a slight reduction in parasitic loss are desired.