Dart 23300010 Valve Spring Shim O.D. x Thick - 1.550 0.015

The Dart 23300010 is a precision valve spring shim designed to help engine builders achieve proper valve spring installed height and tension. This hardened steel shim measures 1.550 inches outer diameter, 0.642 inches inner diameter, and 0.015 inches in thickness.

Key Features:

• Precision 0.015-inch thickness for accurate valve spring height adjustment
• 1.550-inch outer diameter fits common performance valve springs
• 0.642-inch inner diameter accommodates standard valve stems and guides
• Hardened steel construction for durability and wear resistance
• Serrated design on one side to grip the cylinder head surface
• Essential for equalizing valve spring installed heights across all cylinders

Valve spring shims are critical components when building or rebuilding performance engines. They allow precise adjustment of valve spring installed height, ensuring each spring delivers the correct seat pressure and open pressure. By shimming springs to the proper height, engine builders can optimize valvetrain performance, prevent coil bind, and ensure consistent spring tension across all cylinders. Dart Machinery manufactures these shims to exacting tolerances, making them ideal for both street and racing engine applications.