PAC Racing Springs PAC-S121-16 Chromoly Steel Valve Spring Retainers, 1.270-Inch OD, Set of 16

PAC Racing Springs PAC-S121-16 steel chromoly valve spring retainers are designed for high-performance valvetrain applications requiring dependable spring support and precise component fitment. This inside-style spring retainer features a 0.060-inch thickness, a 1.270-inch outside diameter, and a 0.520-inch inside diameter, making it suitable for compatible cylinder head and valve spring assemblies. The retainer is engineered around a 0.640-inch spring inside diameter for secure spring positioning during operation.
Manufactured from durable chromoly steel, the PAC-S121-16 provides the strength and resilience needed for demanding engine environments. Its steel construction helps support consistent valvetrain performance while resisting wear under repeated spring loads. This design is intended for builders, engine professionals, and performance enthusiasts selecting replacement or upgrade components for compatible applications.
This PAC Racing Springs set includes 16 valve spring retainers, providing a complete package for an engine build or valvetrain service. Verify spring, valve, and cylinder head compatibility before installation to ensure proper clearance and seating. With its application-focused design and robust chromoly construction, the PAC-S121-16 is a practical choice for reliable spring retention in performance-oriented engines.

Features:

• Brand: PAC Racing Springs

• Part Number: PAC-S121-16

• Component Type: Inside-style valve spring retainer

• Material: Chromoly steel

• Retainer Thickness: 0.060 inch

• Outside Diameter: 1.270 inches

• Inside Diameter: 0.520 inch

• Spring Inside Diameter: 0.640 inch

• Quantity: Set of 16

• Application: Compatible high-performance valvetrain assemblies