PAC Racing Springs 8 Degree Valve Lock - 3/8 in Valve Stem - Standard Height - Black Oxide (Set of 16) 14789 Dyno tests showed gains of

Dyno tests showed gains of 5 HP and 9 ft-lbs

1969-1969 Oldsmobile F85

shot peened

1972-1974 GMC C15/C1500 Suburban

PAC Racing Springs 8 Degree Valve Lock - 3/8 in Valve Stem - Standard Height - Black Oxide (Set of 16) 14789 Dyno tests showed gains ofProduct Description: Valve Lock 8 Degree 3 8 in Valve Stem Standard Height Steel Black Oxide 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 traditional methods.