Valve spring data: Mounting pressure - 38kg (84lbs) Load - 92kg@10mm (203lbs@10mm) Max. stroke - up to 11mm Made of chrome-silicon steel SAE9254-V 24 pcs. external springs 24 pcs. internal springs 24 pcs. holders titanium 24 pcs. seats With this set, the risk of valve vibration and possible engine failure is minimizedRecommended for engines with stock and racing camshafts and revolutions above 7,500 rpm