1.00" OD, .765" ID, Valve Spring Booster Shims, 100 Pk. | A-104 | B-104

Use these Non-Serrated Valve Spring Booster Shims to support valve springs better. They won't compress to maintain pressure and protect heads from spring abrasion.

Two thicknesses are available:

• .060" - for springs in service
• .030" - for new springs