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

Actual part is different from image

1972-1974 GMC C15/C1500 Suburban

199-102 - AC SD7 SANDEN COMPRESSOR

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.