Description Actual part may differ from image above. This Kit Includes 12 Ferrea Exhaust Titanium Retainers. Ferrea is pleased to offer our Pro-Series Titanium Retainers including sizes that fit both traditional Domestic springs and Sport Compact springs. Precision CNC-machined from aerospace quality titanium, these Pro Retainers are fully heat-treated and finished to exact tolerances, adding strength while offering a 40% weight reduction over conventional steel retainers. Examine the overall quality of Ferrea’s Pro-Series Retainers and see why professional engine builders demand Ferrea Racing Components. – Valve Stem Size: 6 mm.

– Diameter (A): 20.32 mm – In Step Diameter (C): 15.74 mm References: EXHAUST Single Spring-7 Degree Pro CNC Ferrea Racing Springs #S10158. Use Factory OEM Valve Locks Replaces OEM Part # 11-34-7-614-134 / 11 34 7 614 134 / 11347614134.