QA1 GS508 10650C Front Pro Coil Shock System Single Adjustable GM 10in. Spring 650lb. in. Coquette Fourth of July Pattern Cowgirl Boots Seamless 4th of July. QA1 GS508 10650C Front Pro Coil Shock System Single Adjustable GM 10in. Spring 650lb. in. QA1 Single Adjustable Pro Coil kits are an excellent choice for any GM muscle car owner looking for a better stance, ride quality and performance. These easy to install bolt in kits are a great solution for adjustable ride height, and the single adjustable valving provides ample range of tunability for comfort and performance. DIAL IN THE PERFECT STANCE Achieving the perfect, level stance is critical for the overall look and appearance of your car. GM Pro Coil kits offer 0 to 2 inches of ride height adjustability, allowing you to dial in the perfect stance for your Riviera. Adjustments within this range can be made with a simple turn of the spring seat nut. For an additional drop beyond 2 inches, consider adding drop spindles to your car. TUNE YOUR RIDE COMFORT & PERFORMANCE QA1 single adjustable coilovers deliver exceptional ride quality and performance for your vehicle. With the simple turn of a dial, you can effortlessly switch between a comfortable cruise and a more aggressive feel, making them ideal for daily driving or twisty backroads. Accessing the 18 position knob is easy, and by turning the steering wheel to full lock, you can reach in and make your tuning adjustments at the base of the shock. QA1 Pro Coil kits feature high travel, USA made coil springs built to deliver optimal performance. Spring rates are tailored to your vehicle's weight and driving style. Need help choosing the correct spring rate? Watch this video! EASY, BOLT IN INSTALLATION GM Pro Coil Kits seamlessly bolt in with both Original Equipment (OE) stamped steel control arms or QA1 tubular control arms. This gives you the flexibility to use the kit with your existing setup or upgrade your control arms for additional performance gains. MADE IN THE USA QA1 shocks are proudly made in Lakeville, Minnesota. See a complete video on the manufacturing process. FEATURES AND BENEFITS Up to 2 of ride height adjustment allows you to dial in the perfect stance. Achieve the ultimate balance of ride quality and performance with simultaneous adjustment of rebound and compression valving. Easy bolt in installation that works with your factory or upgraded QA1 tubular control arms. Limited Lifetime Warranty for peace of mind. Proudly made in the USA BEST IN CLASS WARRANTY QA1 Single Adjustable Pro Coil Kits are eligable for a Limited Lifetime Warranty. For peace of mind, simply register your shocks at QA1. net Warranty to ensure coverage for as long as you own your vehicle. FITMENT NOTES Spanner wrench: P N T114W or T115W (required) Thrust Bearing Kits (optional): P N 7888 109 RECOMMENDED FRONT SPRING RATE CHART YEAR MODEL SMALL BLOCK SPRINGS BIG BLOCK SPRINGS 1964 1972 GM A Body 400 500 1973 1977 GM A Body 550 650 1978 1988 GM A G Body 400 500 1967 1969 GM F Body 400 500 1970 1981 GM F Body 400 500 1968 1974 GM X Body 400 500 1982 2004 S Series Pickup 400 500 1955 1957 Chevrolet Sedan 400 500 1958 1970 Chevrolet B Body 450 550 1971 1976 GM B Body 500 600 1977 1990 GM B Body 500 600 1991 1996 GM B Body 500 600 1963 1987 C10 750 750 1988 1998 C1500 550 600 1963 1965 Buick Riviera 600 600 Specifications Spring Rate: 650lb in. Springs Included: Yes Shock Valving: Single Adjustable Vehicle Position: Front