PAC Racing Springs 300 Series 7 Degree Valve Spring Retainer - 0.640 in OD Steps - Beehive Spring - Chromoly (Set of 16) TOW-10CAMO 5 in W x 1

5 in W x 1

In order to achieve a flatter flow curve

Metering Block

1968-1986 Chevrolet K20 Suburban CID 396

PAC Racing Springs 300 Series 7 Degree Valve Spring Retainer - 0.640 in OD Steps - Beehive Spring - Chromoly (Set of 16) TOW-10CAMO 5 in W x 1Product Description: Valve Spring Retainer 300 Series 7 Degree 0. 640 in OD Steps Beehive Spring Chromoly Set of 16 Traditional Springs are made from the same size (Diameter) wire throughout the helix of the spring. PAC Racing Springs has partnered with technology leaders in order to provide this advanced new tapered wire product. Tapered wire allows for a true progressive and dual rate without reducing spring travel and increasing weight from