Silver Seal B201 VSI Valve Spring Insert Shim Type B - 030

The Silver Seal B201 is a Type B VSI® (Valve Spring Insert) shim, part of the original valve spring insert system invented and patented by Silver Seal Products Co. since 1959. These precision-engineered cup-style inserts are designed to restore and maintain proper valve spring pressure in gasoline and diesel engines used in passenger cars, trucks, tractors, and industrial applications.

Type B inserts measure .030" thick and are silver in color, compensating for loss of spring pressure — particularly on new springs that experience "heat-set" during the engine break-in period. The VSI® features signature heat-slashing serrations that help the insert seat securely under the valve spring, preventing movement under high-load conditions.

Key Features:

• Type B designation — .030" thickness for standard spring pressure correction
• Cup-style design with heat-slashing serrations for positive seating
• Restores proper installed spring height and pressure
• Compatible with a wide range of passenger car, truck, tractor, and industrial engines
• Part of Silver Seal's VSI® system — the original valve spring insert since 1959
• Sold in box quantities for professional engine builders and machine shops

The Silver Seal B201 VSI® is a trusted solution for professional engine rebuilders needing to correct valve spring tension without replacing springs. It is included in both the 30-box and 50-box VSI assortment kits, offering broad engine coverage for high-volume machine shop use.