52-4041 | QualFast High Performance Springs for GM 6.6L Duramax Diesel

QualFast High Performance Springs are manufactured by the industry-leading high performance valve spring factory using the latest materials and manufacturing processes. All QualFast springs are wound using super-clean chrome silicon or new Alpha 1 or 3 alloy wires. Engineered for high performance to give optimum lift and prevent valve float.

Specs

• OD : 1.180"
• ID : 0.868"
• Closed Load : 75 @ 1.900"
• Open Load : 150 @ 1.400"
• Spring Type : Single
• Coil Bind : 1.368"