Crower 68156NP-1 Features:

Crower valve spring, part number 68156NP-1, sold individually as a 1-piece replacement spring. 1.300 in. diameter dual valve spring design for LS1 and Viper engine applications. Nano-Peen finish helps distinguish this version from the standard non-nano-peened spring. Official Crower listing identifies this spring as a one-piece unit for targeted valvetrain service.

Valve Springs 1.300 Dual LS1 & Viper Nano-peen One-piece Features:

• 1.300 in. dual spring design for LS1 and Viper valvetrains, supports stable valve control in performance engine applications
• Nano-peen surface treatment helps improve fatigue resistance and spring life under repeated high-rpm operation
• Sold as 1-piece valve spring, ideal for custom builds, replacement service, or assembling matched spring sets
• Application-specific fitment for LS1 and Viper engines helps simplify valvetrain selection and installation planning
• Crower part number 68156NP-1, distinct nano-peened version of the 1.300 in. dual valve spring configuration