Regis Manufacturing K5379S Sioux Valve Seat Grinding Pilot - 379

The Regis Manufacturing K5379S is a .379" (9.63mm) Sioux-style valve seat grinding pilot designed for use with .385" Sioux valve seat grinding equipment. Precision-machined for accurate, concentric alignment between the valve seat grinding wheel and the engine cylinder, this pilot is an essential tool for professional engine builders and machine shops performing valve seat reconditioning work.

Key Features:

• Pilot Diameter: .379" (9.63mm)
• Stem Size: .385" — compatible with Sioux-style valve seat grinding machines
• Precision-ground for tight tolerances, ensuring concentric valve seat grinding
• Hardened steel construction for long service life and repeated use
• Designed for use with Sioux valve seat grinding stones and wheels
• Sold individually

Regis Manufacturing has been supplying professional engine builders with high-quality valve seat tools and abrasives since 1959. The K5379S pilot is part of a comprehensive range of Sioux-compatible grinding pilots, making it easy to find the exact size needed for any engine application.