Valve springs data Installed seat pressure - 38kg Load - email@example.com Max. lift - up to 13mm Made from chrome-silicon steel SAE9254-V Outer spring outer diameter: 30.50mm Outer spring inner diameter: 23.20mm Inner spring outer diameter: 21.20mm Inner spring inner diameter: 16.20mm 32 pcs. outer springs 32 pcs. inner springs Fits 8 cylinder 32V Audi engines PT, ABH. 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 7500 RPM.