PAC Racing Springs PAC-S188-16 Valve Spring Shims, 1.250-Inch OD, 0.050-Inch Thick, Set of 16

PAC Racing Springs PAC-S188-16 valve spring shims are designed to provide precise spring seat adjustment during engine assembly and valvetrain setup. Manufactured from durable steel, these shims help establish the correct installed height and maintain consistent valve spring positioning for performance and competition applications. The 0.050-inch thickness allows for controlled adjustment without requiring replacement springs or extensive component changes.
The shims feature a 1.250-inch outside diameter and a 0.570-inch inside diameter for compatibility with appropriately sized valve spring seats and retainers. Their accurately formed design supports dependable alignment and helps distribute spring seat load across the cylinder head. Use them when fine-tuning installed spring height, correcting seat depth variations, or setting up a PAC Racing Springs valvetrain system according to the manufacturer’s specifications.
Each PAC-S188-16 package includes 16 steel valve spring shims, making it suitable for complete engine builds, multi-cylinder applications, or keeping matched adjustment components together during assembly. These shims are intended for use by qualified engine builders and technicians who can verify spring height, coil bind clearance, retainer-to-seal clearance, and other critical valvetrain measurements before operation. The PAC Racing Springs brand is trusted for precision valvetrain components engineered to support reliable performance in demanding environments.

Features:

• Brand: PAC Racing Springs

• Part Number: PAC-S188-16

• Product Type: Valve spring shim

• Material: Steel

• Thickness: 0.050 inch

• Outside Diameter: 1.250 inches

• Inside Diameter: 0.570 inch

• Quantity: Set of 16

• Application: Valve spring installed-height adjustment and valvetrain setup