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The Spring Kit is a drop-in high performance spring kit for all OE LS cylinder heads and is rated for up to .600" lift. This spring kit uses all OE hardware, including seats, retainers, and locks and is 100% drop-in. The 1218s are an ovate beehive spring that has increased loads, rates and frequencies for more aggressive cams. This is a full set of 16 springs. Specs: Number of Springs Per Valve: Single Outside Diameter of Outer Spring (in): 1.290 in. Coil Bind Height (in): 1.140 in. Damper Spring Included: No Install Load: 130lbs Install Height: 1.800" Open Height: 1.175" Open Load: 318 lbs Spring Rate (lbs/in): 313 lbs./in. .
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