Regis Manufacturing BB18 Bullit-Balls Tungsten Carbide Valve Guide Sizing Ball

The Regis Manufacturing BB18 is part of the legendary Bullit-Balls® series — precision tungsten carbide sizing balls engineered for professional engine builders and valve guide reconditioning work. Designed for use in sizing valve guides during engine rebuilding, the BB18 delivers the exacting dimensional accuracy that engine professionals have trusted from Regis Manufacturing since 1959.

Key Features:

• Tungsten carbide construction with a permanently attached steel shank for maximum durability and rigidity
• 90 Rockwell hardness for long-lasting performance under demanding shop conditions
• Precision machined to exact specifications with finished roundness tolerance of .0000008" (eight millionths of an inch)
• Engineered for consistent, repeatable sizing results in valve guide reconditioning
• Compatible with both OEM and bronze valve guide sleeves — note that finished I.D. of bronze sleeves will be .001" smaller than actual ball size

Regis Manufacturing Bullit-Balls® are the professional standard for valve guide sizing precision. Built in the USA and backed by decades of engine building industry expertise, the BB18 is an essential tool for any serious engine rebuilding operation.