PAC Racing Springs 400 Series Titanium Valve Spring Retainer - 0.795 in / 0.517 in OD Steps - Single Spring - Ford Modular (Set of 16) RSI63-616474021B Fully machined and swirl polished

Fully machined and swirl polished

1994-1994 Dodge Viper

1980-1980 Oldsmobile Custom Cruiser

Recess hole size 4 1/2"

Custom ECU calibrations engineering

PAC Racing Springs 400 Series Titanium Valve Spring Retainer - 0.795 in / 0.517 in OD Steps - Single Spring - Ford Modular (Set of 16) RSI63-616474021B Fully machined and swirl polishedProduct Description: Valve Spring Retainer 400 Series 0. 795 in 0. 517 in OD Steps Single Spring Titanium Ford Modular 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