ATI Damper – 6.78in – Alum – 6/4 Grv – 10 Percent UD – LS1/LS2 – F & V Body – 10 Per UD A/C – 3 Ring

ATI Super Damper 917276 is an engine and drive-system specific harmonic damper in the 6.78in – Alum – 6/4 Grv – 10 Percent UD – LS1/LS2 – F & V Body – 10 Per UD A/C – 3 Ring configuration. Confirm the crankshaft, balance requirement, hub, shell, diameter, groove arrangement, accessory drive, and every ATI application note before ordering.

Key Features

• Aluminum Shell: Lightweight at 10.9 lbs reduces front-end rotational mass for quicker engine response.
• 10% Underdrive Pulley: Lowers alternator water pump and A/C speeds by 10% to recover 8-12 HP at the wheels.
• 6/4 Groove Pattern: Matches stock LS pulley bolt pattern with 6-rib main 4-rib A/C grooves for direct bolt-on fit.
• SFI 18.1 Certified: Exceeds NHRA IHRA standards for high-performance and drag racing safety.
• CNC-machined in the USA from billet aluminum and steel.
• 6061-T6 aluminum shell with steel inertia ring bonded in high-strength elastomer.

Fitment

Specifications

What’s Included

One new ATI component identified by manufacturer part number 917276. Hubs, pulleys, belts, bolts, washers, spacers, keys, tools, and installation hardware are included only when expressly stated for this exact part number.

About ATI Performance Products

ATI develops tunable and serviceable Super Dampers, crank hubs, pulleys, transmission components, and engine service hardware for performance and competition applications. Compatibility remains exact-part and engine-system specific.

Related ATI Components

• ATI Damper – 6.78in – Alum – 6 Grv – 10 Percent UD – LS1/LS2 – F & V Body – No A/C – 3 Ring
• ATI Damper – 6.78in – AL – 6/4 Grv – 10 Per UD – LS1/2/3/6 – 97-13 Y Body – 10 Per UD A/C – 3 Ring
• ATI Damper – 5.67in – Alum – 6 Grv – 25 Percent UD – LS1/LS2 – F & V Body – No A/C – 1Pc

Browse the ATI collection for additional dampers, pulleys, and service components.

Frequently Asked Questions

Does ATI 917276 match my engine and accessory drive?
Match the engine family, crank snout and keyway, balance type, hub, outside diameter, belt grooves, accessory drive, and every application note. The stated configuration is 6.78in – Alum – 6/4 Grv – 10 Percent UD – LS1/LS2 – F & V Body – 10 Per UD A/C – 3 Ring.

Is this ATI Super Damper rebuildable?
ATI Super Dampers are serviceable. Inspect the shell, hub, fasteners, timing marks, and elastomers according to the current ATI instructions and service intervals.

Do I need a special installer for this damper?
Use the correct crankshaft damper installation tool and the exact fastener, washer, spacer, key, hub, and torque procedure for the engine. Never hammer the damper onto the crankshaft.

Installation Instructions

Use the current ATI instructions and the engine manufacturer’s service information. Verify crankshaft and hub condition, key and spacer placement, required installer, fastener and washer, runout, pulley alignment, belt routing, clearances, and final torque. Never draw the damper on with an undersized or partially engaged bolt.