More of the torque you want, and less of the harmful harmonics you don’t.
When you’re chasing big power on the LT4 platform, everyone knows the best bang for your buck is more boost. Although the easiest option may appear to be installing a smaller upper pulley, the logic fails under scrutiny. The problem with starting with the upper pulley is the reduction in belt wrap, and the failure to address crankshaft harmonics. Rather, we highly recommend you start your path to higher HP numbers by starting down low, by not only taking advantage of the amazing 6 pounds of weight savings, but the additional belt wrap provided by going with a larger lower pulley first!
That’s exactly why we pair the ATI 918856 Super Damper with DMS’s precision-machined overdrive lower pulleys: to create a synchronized, perfectly balanced front-drive system that can support anything from mild street builds to 1,000+ whp combinations without compromise.
The ATI 918856 is the gold standard for LT4 harmonic control. Unlike the OEM damper, built around a cast-in rubber isolator, the ATI unit uses a rebuildable dual-ring design with high-durometer elastomer technology. This dramatically improves torsional vibration damping, reduces crankshaft whip, and stabilizes valvetrain harmonics under heavy boost and high RPM. The result: smoother power delivery, reduced main-bearing wear, and a safer foundation for high-boost supercharger packages.
But the damper is just the start. This bundle lets you choose from four of DMS’s billet LT4 lower pulleys, each CNC-machined from high-grade aluminum with reinforced belt-tracking geometry to maximize grip and minimize slip:
8.8" (10% OD) – The first step in adding more boost + mild cooling upgrades
9.2" (15% OD) – The industry’s most common choice for street/track dual-use
9.6" (20% OD) – For higher blower speed on built LT4s
Whether you’re compensating for altitude, feeding a ported supercharger, or pushing for upper-limit power on ethanol, these pulleys deliver stable, repeatable boost without overstressing the belt drive.
To keep everything locked down, we include (2) optional upgrades that utilize the best hardware we have available to us.
ARP 234-2503 Crank Bolt – 12-point, heat-treated, ultra-high-tensile hardware delivering consistent clamp load and superior torsional retention. No more throwing away the cheap TTY one time use GM bolt. You can now re-use a superior bolt with confidence.
ARP 613-1750 Lower Pulley Bolt Kit – For customers who refuse to gamble on OEM hardware when running larger OD pulleys and higher harmonic load. We have actually heard of max-effort builds shear there front pulley bolts before they upgraded to ARP.
Together, this system transforms your LT4’s front drive from “adequate” to track-proven, eliminating slip, tightening harmonic control, and allowing you to safely extract every additional RPM your tuner demands.
Why Upgrade?
Superior harmonic stability: ATI’s elastomer design reduces vibration and crankshaft oscillation under high load.
More boost, more efficiency: DMS pulleys maintain belt grip at elevated blower speeds.
Safety at high RPM: High-strength ARP hardware eliminates bolt stretch or loss of clamp load.
Modular pulley changes: Easily swap OD sizes as your build evolves.
Up to a 6 pound weight savings over the heavy iron OEM unit.
Fitment (LT Engine Platform)
Direct-fit for all LT4-equipped vehicles, including:
2017–2024 Camaro ZL1
2015–2019 C7 Corvette Z06
2016–2019 Cadillac CTS-V
LT4 crate engines and custom swapped applications
(For LT1 owners upgrading to LT4 supercharger systems, please contact us for confirmation.)
GMS Notes
For the best results, pair this kit with one of our upgraded cooling packages like our Stage.I SC Cooling System, and one of our Banks iDash Packages to help keep track of your IAT’s. Boost increase varies by pulley size, blower efficiency, and altitude, but most customers see +2–5 psi depending on configuration.
This kit represents the same pulley strategy we run on our in-house ZL1 test car—proven at the track, proven on the dyno, and repeatable in the real world.
Plan on making MORE than 800rwhp? Then we highly recommend you consider upgrading to our 10-rib package in order to say bye-bye to belt slip and help keep all of those ponies at the rear wheels where they below.
Lower Pulley Size:
Crank Bolt:
Lower Pulley Bolts:
Get notified by email when this product is in stock.
ATI LT4 Super Damper + DMS Lower Pulley Bundle
More of the torque you want, and less of the harmful harmonics you don’t.
When you’re chasing big power on the LT4 platform, everyone knows the best bang for your buck is more boost. Although the easiest option may appear to be installing a smaller upper pulley, the logic fails under scrutiny. The problem with starting with the upper pulley is the reduction in belt wrap, and the failure to address crankshaft harmonics. Rather, we highly recommend you start your path to higher HP numbers by starting down low, by not only taking advantage of the amazing 6 pounds of weight savings, but the additional belt wrap provided by going with a larger lower pulley first!
That’s exactly why we pair the ATI 918856 Super Damper with DMS’s precision-machined overdrive lower pulleys: to create a synchronized, perfectly balanced front-drive system that can support anything from mild street builds to 1,000+ whp combinations without compromise.
The ATI 918856 is the gold standard for LT4 harmonic control. Unlike the OEM damper, built around a cast-in rubber isolator, the ATI unit uses a rebuildable dual-ring design with high-durometer elastomer technology. This dramatically improves torsional vibration damping, reduces crankshaft whip, and stabilizes valvetrain harmonics under heavy boost and high RPM. The result: smoother power delivery, reduced main-bearing wear, and a safer foundation for high-boost supercharger packages.
But the damper is just the start. This bundle lets you choose from four of DMS’s billet LT4 lower pulleys, each CNC-machined from high-grade aluminum with reinforced belt-tracking geometry to maximize grip and minimize slip:
8.8" (10% OD) – The first step in adding more boost + mild cooling upgrades
9.2" (15% OD) – The industry’s most common choice for street/track dual-use
9.6" (20% OD) – For higher blower speed on built LT4s
Whether you’re compensating for altitude, feeding a ported supercharger, or pushing for upper-limit power on ethanol, these pulleys deliver stable, repeatable boost without overstressing the belt drive.
To keep everything locked down, we include (2) optional upgrades that utilize the best hardware we have available to us.
ARP 234-2503 Crank Bolt – 12-point, heat-treated, ultra-high-tensile hardware delivering consistent clamp load and superior torsional retention. No more throwing away the cheap TTY one time use GM bolt. You can now re-use a superior bolt with confidence.
ARP 613-1750 Lower Pulley Bolt Kit – For customers who refuse to gamble on OEM hardware when running larger OD pulleys and higher harmonic load. We have actually heard of max-effort builds shear there front pulley bolts before they upgraded to ARP.
Together, this system transforms your LT4’s front drive from “adequate” to track-proven, eliminating slip, tightening harmonic control, and allowing you to safely extract every additional RPM your tuner demands.
Why Upgrade?
Superior harmonic stability: ATI’s elastomer design reduces vibration and crankshaft oscillation under high load.
More boost, more efficiency: DMS pulleys maintain belt grip at elevated blower speeds.
Safety at high RPM: High-strength ARP hardware eliminates bolt stretch or loss of clamp load.
Modular pulley changes: Easily swap OD sizes as your build evolves.
Up to a 6 pound weight savings over the heavy iron OEM unit.
Fitment (LT Engine Platform)
Direct-fit for all LT4-equipped vehicles, including:
2017–2024 Camaro ZL1
2015–2019 C7 Corvette Z06
2016–2019 Cadillac CTS-V
LT4 crate engines and custom swapped applications
(For LT1 owners upgrading to LT4 supercharger systems, please contact us for confirmation.)
GMS Notes
For the best results, pair this kit with one of our upgraded cooling packages like our Stage.I SC Cooling System, and one of our Banks iDash Packages to help keep track of your IAT’s. Boost increase varies by pulley size, blower efficiency, and altitude, but most customers see +2–5 psi depending on configuration.
This kit represents the same pulley strategy we run on our in-house ZL1 test car—proven at the track, proven on the dyno, and repeatable in the real world.
Plan on making MORE than 800rwhp? Then we highly recommend you consider upgrading to our 10-rib package in order to say bye-bye to belt slip and help keep all of those ponies at the rear wheels where they below.
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