ATI 916227 Supercharger Crank Pulley 9.17" 8-Rib 17% OD for LSA/LT4 CTS-V ZL1

Vehicle Fitment

• 2009-2015 Cadillac CTS-V 6.2L LSA (with ATI Super Damper 918854)
• 2012-2015 Chevrolet Camaro ZL1 6.2L LSA (with ATI Super Damper 918854)
• 2016-2019 Cadillac CTS-V 6.2L LT4 (with ATI Super Damper 918856)
• 2017-2024 Chevrolet Camaro ZL1 6.2L LT4 (with ATI Super Damper 918856)

Fitment Notes

• Requires ATI Super Damper -- does NOT fit factory harmonic balancer
• LSA applications: use ATI Super Damper 918854
• LT4 applications: use ATI Super Damper 918856 (wet sump)
• 17% overdrive on LSA engines / 15% overdrive on LT4 engines
• Larger crank pulley increases supercharger speed without smaller blower pulley
• Reduces belt slip vs. running a smaller upper pulley alone
• Sold individually -- hardware included
• LSA idler relocation bracket may be required on factory drive systems

Features

• ATI supercharger crank (lower) drive pulley
• Increases supercharger speed for more boost and power
• 8-rib serpentine for maximum belt grip
• Aluminum construction -- black anodized finish
• Steel hub
• Designed for ATI Super Damper integration

Specifications

• Part Number: 916227 (ATI916227)
• Brand: ATI Performance Products
• Type: Supercharger crank drive pulley
• Pulley Style: Serpentine
• Groove Count: 8
• Outer Diameter: 9.170"
• Overdrive: 17% (LSA) / 15% (LT4)
• Shell Material: Aluminum
• Hub Material: Steel
• Finish: Black anodized
• Hardware Included: Yes
• Weight: 5 lbs (shipping)
• Quantity: Sold individually

Included Components

• 1x ATI supercharger crank pulley (9.170" 8-rib)
• Mounting hardware

Product Description

The ATI 916227 is a 9.170" diameter 8-rib supercharger crank (lower) drive pulley for ATI Super Damper-equipped GM LSA and LT4 supercharged engines. This larger-than-stock crank pulley increases supercharger rotational speed by 17% on LSA engines (2009-2015 CTS-V, 2012-2015 Camaro ZL1) and 15% on LT4 engines (2016-2019 CTS-V, 2017-2024 Camaro ZL1) -- delivering more boost and power without running a smaller upper supercharger pulley, which often leads to belt slip at higher power levels.

By increasing the crank pulley diameter rather than decreasing the blower pulley, this approach maintains better belt wrap and contact area for improved grip under high-load conditions. The aluminum shell with black anodized finish mounts to an ATI steel hub and integrates directly with ATI Super Damper units -- 918854 for LSA applications and 918856 for LT4 wet sump applications. Does not fit factory harmonic balancers. An idler relocation bracket may be required on LSA vehicles with factory drive systems to accommodate the larger pulley diameter. Hardware included. From ATI Performance Products -- over 55 years of racing product development and manufacturing.