Supertech Valve Spring Kit - BMW E30 M3 S14

Supertech Dual Valve Spring Kit   BMW Valve springs are made with premium Super clean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high rpms and better memory.   These springs have been thoroughly tested and performed flawlessly with nearly all the cams from Schrick, Cat Cams and Sunbelt.   About Supertech Valve Springs & Retainers   Supertech Valve springs are made with premium Superclean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high rpms and better memory.   The Retainers are manufactured with high quality military certified Titanium alloy, CNC machined for a tight fit that will ensure a long durability.   OPTIONS SPECIFICATIONS BELOW   Option 1 -  Pressure -Seat - 78 lbs@35.50mm Open - 204 lbs@11.00mm Max Net Lift - 14.50mm Coil Bind - 20.70mm Spring Rate - 11.50 lbs/mm   Option 2 -  Pressure- Seat - 92 lbs@35.50mm Open - 220 lbs@11.00mm Max Net Lift - 14.00mm Coil Bind - 21.50mm Spring Rate - 1