Valve springs data Installed seat pressure - 30kg Load - 100kg@13mm Max. lift - up to 13mm Made from chrome-silicone steel SAE9254-V 16 pcs. outer springs 16 pcs. inner springs Fits Opel / Vauxhall 4 cylinder 1.4 1.6 1.8 2.0 16V engines. 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.