The Worlds Finest Oval Track Spring. The long life 9900 Series gold stripe valve springs are test proven for 1,000 racing miles. That's every part number and every batch! Near-Zero load loss. Absolute maximum endurance. Includes the Gold Standard Test Certification and if you are not completely satisfied with the performance of these springs, return them to ISKY for a full refund.

O.D./I.D: 1.570/.740
App: R
Max Lift: 730
Spring Type: Dual w/Damper
Seat Pressure: 250/2.030
Open Pressure: 625/1.300
Coil Bind: 1.200