Silver Seal VSI Valve Spring Insert Shim Type B

Silver Seal VSI Type B valve spring inserts (also called valve spring shims or spring seat shims) help engine builders set installed spring height and keep valve spring pressure consistent. Type B is the version intended for use with new valve springs. It compensates for the pressure loss that can occur as new springs heat-set during break-in.

Key Features:

• Patented serrated design: VSI inserts have heat-retarding serrations, which set them apart from plain flat shims.
• Corrects installed height: Helps equalize installed height and spring pressure from one spring to the next.
• Protects the spring seat: Provides a hardened surface between the spring and the cylinder head. This helps prevent spring wear on the seat, which matters especially with aluminum heads.
• Built for load: Designed to resist compression under spring pressure, where plain shims can fail.
• Wide range of fits: The Silver Seal VSI line comes in many inside and outside diameter combinations. Match the insert's I.D. and O.D. to your spring seat.

Silver Seal's VSI line has been used by engine builders and machine shops for decades. It suits engine rebuilds, performance builds, and cylinder head work where accurate valve spring installed height is needed.