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Valve Spring (Cylinder Head Intake & Exhaust) Chevy Duramax 6.6L Diesel Engine. SBI# 160-1457
**This is the 2nd design, the ID of the spring is .865″ which is too small for the retainer to fit into for the 1st design. OEM Retainer # 97329106 must be used with the 2nd design spring.