52-4040 | QualFast High Performance Springs for Ford 6.0L, 6.4L 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 : 0.995"
• ID : 0.657"
• Closed Load : 84 @ 1.880"
• Open Load : 252 @ 1.400"
• Spring Type : Single
• Coil Bind : 1.290"