PAC Racing Springs PAC-S186-16 Valve Spring Shims, 1.500 in OD, 0.020 in Thick, Set of 16

PAC Racing Springs PAC-S186-16 valve spring shims are designed to provide precise spring seat adjustment in high-performance valve train applications. Each shim is manufactured from durable steel and helps establish the correct installed spring height while supporting consistent valve spring positioning. The 0.020-inch thickness allows for fine adjustment during cylinder head assembly and valve train setup.
This set includes 16 shims with a 1.500-inch outside diameter and a 0.570-inch inside diameter, making them suitable for compatible PAC Racing Springs and other valve spring configurations. The shims install between the valve spring and spring seat to help compensate for machining variations, optimize spring pressure, and maintain proper valve train geometry. Verify spring seat, retainer, and valve guide compatibility before installation.
Built for performance-focused engine builders, the PAC Racing Springs PAC-S186-16 set offers a practical solution for achieving accurate installed height and reliable spring support. These steel shims are well suited for racing, performance street, and engine rebuild applications where precise valve spring setup is essential. Professional installation and measurement of installed height are recommended to ensure the correct combination of components and spring pressures.

Features:

• Brand: PAC Racing Springs

• Part Number: PAC-S186-16

• Product Type: Valve spring shim set

• Material: Steel

• Shim Thickness: 0.020 in

• Outside Diameter: 1.500 in

• Inside Diameter: 0.570 in

• Quantity: Set of 16

• Application: Valve train and valve spring installed-height adjustment