Description Actual part may differ from image above. This Kit contains24Ferrea Single Intake & ExhaustValve Springs Ferrea Valve Springs are developed from high strength alloys, including premium grade chrome silicon steel. These springs are manufactured with state-of-the-art equipment. Our springs are heat-treated and stress relieved, which dramatically increases the spring’s life. Strict quality control procedures and cycle testing ensures consistency from batch to batch. Ferrea Valve Springs provide the stability needed for high lift, high rpm racing engines, while minimizing the load loss for today’s aggressive valvetrain combinations.

– Open Pressure 170lbs @ 26.50mm – Max Lift 12.50mm – Coil Bind 23.15mm – Manufacturer Ferrea – Valve Spring Type Single – Seat Pressure 70lbs @ 36.50mm – Valve Spring Rate 254lbs/inch This Spring requires 2 Ferrea Titanium Retainers (Exhaust) # E11130 and (Intake) # E11131 and Factory supplied Spring Seat Locator /Valve Hat Seal. Replaces OEM Part #11-34-7-563-460 / 11 34 7 563 460 / 11347563460.