HomeResourcesSpring InstallationSpring InstallationMeasure The distance between the valve top & the surface of the cylinder head on the spring pocket(Valve stem installed height)A) Measure the distance between the valve top and the surface of the cylinder head on the spring pocket. B) Valve top to retainer top C) Thickness of the retainer D) Thickness from the cylinder head to the seat locator outer recess Installed height of the outer spring: A-B-C-D= IH outer E) Retainer inner spring step F) Seat locator inner step IH outer - E-F= Inner spring IH Outer spring IH=34mm Inner spring IH=29.6mmOutter spring or single springValve protution (A)Valve tip to retainer (B)Seat thickness (F)Free length Rate of springInstalled heigthSeat pressureOpen at 10mmCalculatexInner spring if DualValve protution (A)Valve tip to retainer (B)Retainer thickness (C+E)Seat thickness (F+D)Free lengthRate of springInstalled heigthSeat pressureOpen at 10mmCalculatex