PAC Racing Springs 400 Series 10 Degree Titanium Valve Spring Retainer - 1.040 in / 0.715 in OD Steps - 1.050 in Dual Spring 9057-313 drag ''R'' series adjustable and

drag ''R'' series adjustable and non-adjustable valving options

18-1/2 in Wide Seat

Subsequent development led to numerous versions and designs

All the features of our race carburetors merged into one street-friendly package

DEI's Titanium Pipe Shield provides heat protection up to 1350F

PAC Racing Springs 400 Series 10 Degree Titanium Valve Spring Retainer - 1.040 in / 0.715 in OD Steps - 1.050 in Dual Spring 9057-313 drag ''R'' series adjustable andProduct Description: Valve Spring Retainer 400 Series 10 Degree 1. 040 in 0. 715 in OD Steps 1. 050 in Dual Spring Titanium Sold Individually 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