Designed to fit Ford Racing's M-6513-A50 valve springs.
Valve Spring Retainer Specifications:
- Single lock groove
- 11/32" stem diameter
- 1.500" spring OD
- 1.375" retainer OD
- 1.060" first step
- 0.675" second step
- Made from 7 degree machined steel
Use on 1979-1995 production 5.0L (302) HO and GT40 valves eliminates exhaust rotators and will result in 1.800" intake and exhaust spring installed height.