QA1 High Travel Coil-Over Spring - 2-1/2" I.D. x 10" Tall - 100 lb. 6100BK Holley HP Billet Regulators

Holley HP Billet Regulators

Drive Stud

Retains GM factory axle pipes with AFM valves Requires Factory GM NPP Valve Module for Installation

Start retard eases pressure on the starter

QA1 High Travel Coil-Over Spring - 2-1/2" I.D. x 10" Tall - 100 lb. 6100BK Holley HP Billet RegulatorsPowder Coated, Chrome Appearing Silicon Manganese SteelAll QA1 springs are manufactured using the highest quality chrome silicone. This material offers high strength, consistency and longer life. Cold Wound Heat Treated Shot PeenedAll QA1 springs go through intensive manufacturing processes to ensure consistency, accuracy and durability. Squared EndsAll QA1 springs are ground at both ends to ensure straight, consistent and accurate operation.