Manley Performance Drag Race Valve Springs - 1.640 Double

- 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 .880

- O.D. 1.640

- I.D. .860

- Installed / Open Pressure 250 @ 2.000 / 800 @ 1.150

- Rate (lbs/in.) 647

- Coil Bind 1.070

- Weight (grams) 149