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

The QA1 GS501-10600C is a front Pro-Coil coilover system engineered for GM muscle cars and full-size vehicles, delivering a significant upgrade over factory suspension in ride quality, handling, and stance control. This kit includes a pair of single-adjustable GS501 billet aluminum coilover shocks paired with specially designed 10-inch, 600 lb/in tapered flat large-diameter springs (style 10HTBF600), and all necessary mounting hardware.

The single-adjustable valving allows you to simultaneously tune rebound and compression with a simple dial adjustment, giving you a broad range of tunability for everything from comfortable street driving to spirited performance use. The fully threaded shock body allows up to 2 inches of ride height adjustment, dialed in easily with a turn of the spring seat nut — no special tools required.

The included high-travel coil springs are American-made and feature fewer coils with a smaller wire diameter for increased travel, reduced unsprung weight, and faster suspension response. This kit is specifically designed for big block engine applications and bolts in seamlessly with both OEM stamped steel control arms or QA1 tubular control arms. Every shock is 100% dyno tested and serialized at QA1's Lakeville, Minnesota facility.

Kit Includes:

• 2 x QA1 GS501 Single Adjustable Billet Aluminum Coilover Shocks
• 2 x 10 in. Tapered Flat Large Diameter Springs — 600 lb/in Rate (P/N 10HTBF600)
• All necessary mounting hardware

Key Features:

• Up to 2 inches of ride height adjustability via threaded shock body and spring seat nut
• 18-position single-adjustable valving for simultaneous rebound and compression tuning
• Lightweight billet aluminum shock bodies for reduced unsprung weight
• High-travel, USA-made coil springs designed specifically for QA1 Pro-Coil systems
• Designed for big block engine applications
• Bolt-in installation compatible with OEM or QA1 tubular control arms
• 100% dyno tested and serialized — serviceable and rebuildable by QA1 authorized centers
• Made in Lakeville, Minnesota, USA
• Ideal for drag racing, street performance, autocross, road racing, and street rod builds
• Sold as a pair

Optional accessories include spanner wrenches (P/N T114W or T115W, required for adjustment) and thrust bearing kits (P/N 7888-109). QA1 Pro-Coil single adjustable shocks are eligible for QA1's Limited Lifetime Warranty when registered at QA1.net/Warranty.