S&S Heavy Duty Spring Kit 0.605" Lift - M8

Engineered for high-performance Milwaukee-Eight builds, this S&S Heavy-Duty Valve Spring Kit is designed to handle aggressive cam profiles and sustained high RPM operation.

• High-Performance Conical Single-Wire Springs – Built to support up to 0.605" valve lift with exceptional stability and reduced valve float.

• Precision Rates – 68 lb seat pressure at 1.535" installed height, 364 lb at max lift for consistent valve control up to 6,500 RPM.

• Complete Kit – Includes springs, keepers, top and bottom collars, and seals for a full upgrade solution.

• Heavy-Duty Steel Construction – Ensures durability under the high loads of performance cams and elevated compression.

• Made in the USA – Manufactured to S&S Cycle’s strict standards for reliability and race-proven performance.

Why Upgrade:
When installing Stage 2, 3, or 4 cams or increasing engine RPM limits, stronger valve springs are essential to prevent valve float, premature wear, and loss of power. This kit provides the necessary spring pressure and precision to maintain accurate valve timing and optimal performance in any high-output Milwaukee-Eight setup.