QA1 GS501-10600A GM Pro-Coil Single Adjustable Front Coilover System 10in 600lb/in Tapered Pigtail

The QA1 GS501-10600A Pro-Coil Single Adjustable Front Coilover System is a complete bolt-in coilover conversion kit engineered for GM muscle cars. Featuring lightweight billet aluminum single-adjustable shocks paired with specially designed 10-inch, 600 lb/in tapered pigtail springs, this kit delivers a major upgrade in both ride quality and handling performance over the factory suspension setup.

The fully threaded aluminum shock body provides up to 2 inches of ride height adjustability, and adjustments can be made with a simple turn of the spring seat nut — no complex tools required. The kit is designed to bolt directly into applications using OE stamped steel control arms or QA1 tubular control arms, making installation straightforward with minimal modification.

The included 10HTSP600 tapered conical springs feature a pigtail upper end that seats into the original spring bucket in the frame. This design allows for a longer, lighter spring that maximizes stored energy and improves weight transfer. The lower end seats on the coilover shock body, with spring pressure located in the frame rather than on a single stud for added durability.

Key Features:

• Single-adjustable billet aluminum coilover shocks with 18 simultaneous compression and rebound valving positions
• 10-inch, 600 lb/in tapered pigtail (pigtail upper end) high-travel springs — Part No. 10HTSP600
• Up to 2 inches of ride height adjustability via threaded shock body
• Easy bolt-in installation — compatible with OE stamped steel or QA1 tubular control arms
• Designed for applications with big block engines
• Extended length: 17.00 in. | Collapsed length: 11.63 in. | Threaded adjustment range: 3.00 in.
• Recommended front-end weight: 2,201–2,300 lbs.
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA (Lakeville, Minnesota)
• Eligible for QA1 Limited Lifetime Warranty (registration required at QA1.net/Warranty)
• Kit includes: (2) GS501 single-adjustable coilover shocks, (2) 10HTSP600 tapered pigtail springs, and all mounting hardware
• Note: Spanner wrench P/N T114W or T115W required (sold separately); Thrust Bearing Kit P/N 7888-109 available (optional)

Suitable for drag racing, street performance, autocross, road racing, and street rod applications, the QA1 GS501-10600A Pro-Coil kit gives GM muscle car owners the combination of adjustable stance and tunable damping in one complete, USA-made package.