Valve springs data Installed seat pressure - 38kg Load - 91kg@10.2mm Max. lift - up to 13.10mm Made from chrome-silicon steel SAE9254-V 24 pcs. outer springs 24 pcs. inner springs 24 pcs. titanium retainers With this set the risk of valve flutter and a possible engine failure is minimized. Recommended for engines with series and racing camshafts and over 7600 RPM. Titanium retainers are very light and strong, helps eliminate valve float.