QA1 10HTSF450 Tapered High Travel Spring, 3.5in ID x 10in, 450 lbs/in, Silver Powder Coated

Fits select 1968-1972 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models, including Chevelle, El Camino, GTO, and Cutlass.

The QA1 High Travel Series tapered spring is engineered to reduce unsprung weight and maximize suspension response. Manufactured in the USA from high-tensile chrome silicon alloy, these springs utilize a smaller wire diameter and fewer coils than standard springs. This design increases the distance between coils to prevent premature coil bind while maintaining a consistent spring rate throughout the suspension cycle. Each spring is cold-wound, heat-treated, and shot-peened to ensure long-term durability and fatigue resistance.

To ensure a perfect fit and stable operation, the ends are precision-ground for squareness. The silver powder-coated finish provides excellent corrosion resistance, and every spring is clearly marked with its free length and rate for easy identification. QA1 backs these springs with a lifetime guarantee to remain within 2% of their original free height and rate under normal operating conditions.

• Manufacturer Part Number: 10HTSF450
• Spring Rate: 450 lbs/in
• Free Length: 10 inches
• Inside Diameter: 3.5 inches (Tapered)
• Material: High-tensile chrome silicon steel
• Finish: Silver powder coated
• Ground ends for consistent seat pressure and alignment
• Lifetime guarantee on spring rate and height
• Made in the USA