QA1 High Travel Coil-Over Spring - 2-1/2" I.D. x 10" Tall - 400 lb. Residual Pressure Valve MAF / PCM / Throttle

MAF / PCM / Throttle Pedal / Wiring Harness

Arms feature steel cross shafts

Specifically designed to perform at higher engine speeds with significant power increase over standard Hydraulic lifters

High quality O-Rings for fittings

QA1 High Travel Coil-Over Spring - 2-1/2" I.D. x 10" Tall - 400 lb. Residual Pressure Valve MAF / PCM / ThrottlePowder 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.