QA1 GD507-11250C GM Front Pro-Coil Double Adjustable Coilover Shock Kit 11in 250lb/in

The QA1 GD507-11250C is a front Pro-Coil double adjustable coilover shock kit engineered for GM full-size performance vehicles. This stock-mount system features lightweight billet aluminum construction and delivers independent compression and rebound adjustability, giving drivers precise control over suspension tuning for any driving style — from weekend cruising to competitive racing.

The shocks feature a fully threaded body for easy ride height adjustment, allowing you to fine-tune stance and weight balance for superior handling. Each unit is 100% dyno tested and serialized at the factory for consistent, proven performance. The kit includes a pair of double adjustable aluminum coilover shocks, a pair of specially designed 11-inch, 250 lb/in high-travel springs, and all required mounting hardware.

Key Specifications:

• Adjustability: Independent compression and rebound double adjustable
• Construction: Lightweight billet aluminum coilover shocks
• Compressed Length: 9.63 inches
• Extended Length: 14.50 inches
• Spring Length: 11 inches
• Spring Rate: 250 lb/in
• Spring Style: Tapered flat (large)
• Mount Type: Stock mount

Kit Includes:

• (2) QA1 Double Adjustable Aluminum Coilover Shocks
• (2) High-Travel 11" / 250 lb/in Performance Springs
• All Mounting Hardware

Pro-Coil System Features:

• Ride height adjustable via fully threaded shock body
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Bolt-in installation
• Made in the USA
• Sold in pairs
• Suitable for drag racing, street performance, autocross, road racing, and street rod applications

QA1's Pro-Coil high-travel springs are purpose-built with fewer coils and a smaller wire diameter than standard springs, increasing coil spacing for greater travel. This design reduces unsprung weight and improves suspension response for optimized handling dynamics.