QA1 MG507-09550D Mod Series GM Front Pro Coil System, 550 lb.

The QA1 GM Pro Coil Systems are available for 1963-1982 Corvettes and for 1958-1970 Full Size Chevrolet vehicles, including Impalas, Bel Airs and Caprices. They a great option for anyone looking for fully adjustable ride height and valving control. Choose a spring rate and adjustability that fits your driving style, adjust the valving to match and you are on your way. These shocks also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling.

Specially designed for QA1's Pro Coil Systems, the American-made lightweight high travel springs* have fewer coils and a smaller wire diameter, resulting in increased travel due to the larger distance between the coils. They reduce unsprung weight and react faster, optimizing suspension performance. Multiple spring rate options are also available and have been successfully tested in various applications, from casual street driving to hard core race applications.

Adjustable Pro Coil System Features:

• MOD™ Series - independent compression and rebound double adjustable
• Lightweight Billet Aluminum Coil-Over Shocks
• High Travel Springs*
• Easy, Bolt-In Installation
• Ride Height Adjustable
• 100% Dyno Tested and Serialized
• Serviceable and Rebuildable by QA1 Authorized Service Centers
• Made in the USA
• Used in drag racing, street performance, autocross, road racing and street rod applications
• Sold in Pairs

Additional MOD™ Series Features:

• Features QuickTune™ technology - modular valve packs that allow for completely revalving the shock without having to remove it from the car!
  • Medium compression and rebound valve packs standard
  • Soft or firm compression and rebound valve packs also available
• 24 click independent compression and rebound adjustment with low-speed bleed
• Large solid piston (with blow-off valve) for improved driver feel and control with up to 1,600 lb. force
• High-speed valving adjustment (coarse adjustment)—relates to shock operation during impact events, like hitting a pothole or curb 
• Low-speed valving (fine-tune adjustments)—adjusts ride quality and weight transfer on corner entry/exit; more bleed for softer feel and less bleed for stiffer feel
• Indexable base eyelet—multiple mounting position to optimize knob access and provide more mounting flexibility
• Made to be used with bottom eyelet style mount in tubular control arms
• Thrust bearings included

SPRING RATE CHART

The chart below is a general guideline for selecting spring rates for QA1's GM Front Pro Coil Shock Systems. Spring rates may vary depending on applications, usage, and personal preference.

AVERAGE VEHICLE WEIGHT

Not sure what your vehicle weighs? See our detailedwith Vehicle Weights for general guidelines on determining the approximate weight of popular vehicles.

Fits: 1963-1982 Corvettes; 1958-1970 Full-Size Chevrolet - includes Impala, Bel Air, Caprice

MOD™ Series Shock Installation and Quick Tuning Guide

MOD™ Series Pro Coil Installation Guide

Spring Rate Chart (PDF)