SB Chevy LS Series, LT-1, LT-4, L-98 NexTek High Performance Hydraulic Roller Valve Springs. Super Finished single conical ovate wire. .650" maximum lift, 150 lbs.@1.800", 380 lbs.@1.150", 353 lbs./in spring rate, 1.100" coil bind, 1.311" OD, 73 gram weight.