Edelbrock Sure Seat Valve Springs [Type Non-Rotator | Seat Pressure 138 lbs. | Installed Height 1.800 | Open Pressure 326 lbs. @ 0.600| O.D. (L) | I.D. (M) | Coil Bind 1.140] (GM LS1) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS