1.00" OD, .688" ID, Valve Spring Shims, 100 Pack | A-101 | B-101 | C-101

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.

Three thicknesses are available:

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