Hypercoils 12" UHT Barrel 2-1/2" I.D. Coil-Over Spring - 275 lb. 57950BK The Stage has comfortable ergonomic

The Stage has comfortable ergonomic shoulder straps and padded back

Include snap-on spark plug wire retainer and instructions

this flat one-piece guide plate set is designed for Pontiac 350-455 and AMC 290-401 engines with 7/16" studs and 5/16" pushrods

Available in swivel and non-swivel styles

Hypercoils 12" UHT Barrel 2-1/2" I.D. Coil-Over Spring - 275 lb. 57950BK The Stage has comfortable ergonomicOptimum Body Diameter (OBD) Hypercoils feature a unique design concept that adjusts the body diameter of the spring relative to the end coils. The OBD design enables Hyperco to take full advantage of its ultra high tensile material by optimizing the applied stress through adjusting the spring's body diameter. The results are in and they are simply incredible: More Deflection Less Weight Increased Rate Linearity More Resistance to Bowing Fits All