Spark Plug Index Shims 14mm Small O.D.

Spark Plug Washer - Small OD - Indexing - 14 mm Flat Seat - 60 and 90 Degree Shims - ALL-PRO Heads - Set of 24 / Shims are designed for flat seat 14mm spark plugs and have a .720 O.D. for close tolerance spark plug pockets such as the All-Pro cylinder heads.