Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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For my own, as well as customer's Pontiac A & F body restorations, have always specified the springs by original application & original part numbers. CSS has all the original design specs & GM part numbers. They can also manufacture & supply different spring rate coils that are slightly lower, or taller. On a heavily modified vehicle, you can also total the weight reduction points that you've undertaken; i.e., substitution of aluminum heads & intake, fiberglass hood, fiberglass or carbon fiber endura nose, removal of AC system, bumper structure removal, alum master, change to manual strg, elimination of sound deadener, etc... & they will take the weight savings into the formula & specify the front coil springs your vehicle needs.