QA1 GD507-10650C GM Pro-Coil Double Adjustable Front Coilover System 650 lb/in

The QA1 GD507-10650C GM Pro-Coil Double Adjustable Front Coilover System is a complete bolt-in front coilover conversion kit designed for GM muscle cars and full-size vehicles. This kit delivers the versatility to perform equally well on the street or at the track, offering both ride height adjustment and independent valving tuneability in a single package.

At the heart of this kit are two lightweight billet aluminum double-adjustable shocks featuring 18 positions of compression adjustment and 18 positions of rebound adjustment — yielding 324 unique valving combinations for precise, application-specific tuning. The fully threaded shock body provides up to 2 inches of ride height adjustability, allowing you to dial in the perfect stance or fine-tune front-end weight balance for superior handling. Shock height measures 9.63 inches compressed and 14.50 inches extended.

Included are two USA-made high-travel coil springs with a 10-inch free length and a 650 lb/in spring rate, optimized for front end weights of 2,301–2,400 lbs. These specially engineered springs feature fewer coils and a smaller wire diameter than conventional springs, resulting in reduced unsprung weight and faster response for optimized suspension performance.

Kit Contents:

• 2x Double-adjustable billet aluminum Pro-Coil shocks (clear anodized)
• 2x 650 lb/in high-travel coil springs (10-inch free length, silver powdercoated)
• All necessary mounting hardware

Key Features:

• Independent compression and rebound adjustment — 324 total valving combinations
• 18-position adjustment knobs accessible at the base of the shock
• Fully threaded body for up to 2 inches of ride height adjustment
• Bolt-in installation — compatible with OE stamped steel or QA1 tubular control arms
• 100% dyno tested and individually serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA
• Suitable for drag racing, street performance, autocross, road racing, and street rod applications
• Limited Lifetime Warranty (registration required at QA1.net/Warranty)

A spanner wrench (P/N T114W or T115W) is required for installation. Optional thrust bearing kits (P/N 7888-109) are also available separately from QA1.