PAC Racing Springs PAC-S129-16 Chromoly Valve Spring Retainers, Inside, Set of 16

PAC Racing Springs PAC-S129-16 valve spring retainers are designed for high-performance engine applications requiring dependable spring location and durable valvetrain support. Manufactured from strong chromoly steel, these inside-style retainers provide a reliable interface between the valve spring and cylinder head while helping maintain consistent spring alignment during operation. This set includes 16 retainers for a complete V8 valvetrain installation.
The PAC-S129-16 retainers are engineered for use with valve springs featuring a 0.680-inch spring inside diameter. Their 1.270-inch outside diameter and 0.520-inch inside diameter support proper component fitment, while the 0.060-inch-thick design delivers a balance of strength and weight suitable for demanding performance builds. The steel construction is intended to withstand the repeated loading and high operating conditions associated with upgraded valvetrains.
These PAC Racing Springs steel C/M spring seats are a practical choice for builders, engine professionals, and enthusiasts replacing worn components or assembling a performance cylinder head. Verify spring, retainer, valve, and cylinder head compatibility before installation to ensure correct fit and safe operating clearance. The PAC-S129-16 set is supplied as 16 matching valve spring retainers for convenient installation and consistent component selection throughout the engine.

Features:

• Brand: PAC Racing Springs

• Part Number: PAC-S129-16

• Component Type: Inside valve spring retainer

• Material: Chromoly steel

• Retainer Thickness: 0.060 inches

• Outside Diameter: 1.270 inches

• Inside Diameter: 0.520 inches

• Compatible Spring Inside Diameter: 0.680 inches

• Quantity: Set of 16