MANLEY NexTek SERIES High Performance Valve Springs [Maximum Valve Lift .800 | O.D. 1.324 | I.D. .676 | Installed/Open Pressure 165 @ 1.800 515 @ 1.000 | Rate (lbs./in.) 435 | Coil Bind .900 | Weight (grams) 90] (GM LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS