MANLEY NexTek SERIES High Performance Valve Springs [Maximum Valve Lift .660 | O.D. 1.295 | I.D. .676 | Installed/Open Pressure 155 @ 1.810 405 @ 1.150 | Rate (lbs./in.) 379 | Coil Bind 1.100 | Weight (grams) 93] (GM LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS