Manley Performance Pro Stock / Fuel / Alcohol NexTek Series Drag Race Valve Springs

- Unequalled performance

- All springs are triple except 221424, 221425 & 221454 which are double w/o damper

- Better valve train stability and component life

- Ideally suited for Sportsman Drag Racing applications

- Sportsman and Bracket Classes

- Maximum Valve Lift 1.000

- O.D 1.677

- I.D .632

- Installe Open Pressure 370 @ 2.200/ 1140 @ 1.200

- Rate lbs/in. 770

- Coil Bind 1.142

- Weight 193 grms.