ARP Gen V LT Engine Lower Pulley Bolts

Griffin Motorsports Upgraded ARP Lower Pulley Bolt Kits

For LT4 ZL1 + CTS-V + Z06 + CT5 ATI Damper Systems

Not all bolts are created equal, especially when they’re responsible for holding your lower pulley together on a high-horsepower LT4 build. What has been made crystal clear is that the standard fully threaded bolts commonly used in lower pulley systems place the load directly on the weakest part of the fastener: the thread root.

At moderate power levels, that’s fine.
At high boost and high torque? That’s where problems start.

THE PROBLEM

Under real-world conditions, your lower pulley sees more than just steady torque. It is also a victim to;

• Supercharger load spikes

• Belt harmonics and oscillation

• Repeated shock loading (especially at the drag strip)

When a fully threaded bolt is loaded in shear:

• The stress is concentrated at the threads

• Threads act as stress risers

• Fatigue resistance is reduced

Once movement begins, failures can escalate quickly.

We have all seen high HP cars shear the lower bolts right off, and the results can be catastrophic! Luckily, GMS has two simple solutions depending on how spicy your build is. For builds under 900rwhp simply upgrading your 3 bolts system (likley on an 8-rib system should work just fine) But for those who have push past 900rwhp, and well into 4 digits, then if you have not already upgraded to a proper 10-rib kit with 6 bolt lower pulley, then you might consider upgrading to the ATI hardened hub that is machined for 6 bolts, and then upgrading to our 6-bolt ARP kit.

THE GRIFFIN MOTORSPORTS SOLUTION

We’ve sourced premium ARP fasteners specifically designed to address this issue, and simply repackaged for easy purchase. This solutions works for the following reasons.

Smooth Grip (Shouldered) Design

• Shear load is carried on the full 3/8" shank, not the threads

• ~40% greater shear cross-sectional area vs threaded section

• Reduced stress concentration and improved durability

Premium ARP Material

• High-strength alloy construction

• Excellent resistance to fatigue and deformation

• Designed for high-performance and racing environments

Maintains Clamp Load Under Stress

• More consistent preload retention

• Longer bolts provide 20% more thread engagement

• Better resistance to loosening under vibration and heat cycling

REAL-WORLD BENEFIT

Compared to standard fully threaded bolts:

• Increased shear capacity by 60%

• Improved fatigue resistance under dynamic loading

• Reduced risk of bolt failure in high-torque applications

This isn’t just about “stronger bolts”—
it’s about eliminating a known weak point in high-horsepower builds.

AVAILABLE CONFIGURATIONS

Choose the setup that matches your system:

• 3-Bolt Pack – For standard ATI lower pulley configurations

• 6-Bolt Pack – For modified ATI dampers like THIS one we inventory.

RECOMMENDED FOR

• LT4 builds running boost levels of 20psi and greater

• 700–1,000 WHP street and dual-purpose cars

• 1,000+ WHP drag or high-load applications

• Anyone upgrading to or running an ATI damper system

• Builders who want added reliability and peace of mind

WHAT HAPPENS IF YOU DON’T UPGRADE?

If a lower pulley bolt fails, you’re not just replacing hardware.

You could be dealing with:

• Damaged damper or hub

• Potential front engine damage

• Worst of all would be a crash due to front end damage

A small upgrade here can prevent a big failure later.

THE GRIFFIN MOTORSPORTS APPROACH

At Griffin Motorsports, we focus on the details others may overlook. Because at high horsepower, it’s not always the big parts that fail…it’s the small ones that weren’t upgraded.

Upgrade your lower pulley hardware the right way,
and eliminate one more weak link in your LT4 build.

FITMENT: ATI Super Damper for the Gen V platform.