1.680 Spring Seat Cutter Cuts Guide .630

The COMP CAMS 1.680 Spring Seat Cutter Cuts Guide .630 (SKU COM4722, MPN 4722CPG) is a precision valve spring seat cutter designed for engine machine shop work and high-performance engine assembly. This hardened steel and carbide cutting tool produces accurate valve seat geometry on cylinder heads, ensuring proper spring seating and consistent valve operation across a wide range of engine platforms.

The 1.680-inch outer diameter cutting surface works with .630-inch outer diameter guides, allowing machinists to establish correct valve seat dimensions with tight tolerances. The dual-material construction—hardened steel body paired with carbide cutting edges—delivers extended tool life and clean, repeatable cuts across production runs. This universal design fits standard machine shop equipment and accepts standard cutter drive shafts, making it compatible with most valve seat cutting machines without requiring specialized adapters.

Engine builders and cylinder head reconditioning shops rely on this cutter for both stock restoration and performance builds. Correct valve seat dimensions are critical for sealing integrity, proper heat transfer from the valve to the head, and predictable spring preload—factors that directly affect reliability and performance. Whether rebuilding factory cast-iron heads or preparing aluminum performance castings, this cutting tool maintains dimensional consistency across multiple heads in a job lot.

COMP Cams valve seat cutters are standard equipment in professional machine shops and are used across automotive, powersports, and small engine rebuilding. The 4722CPG model is sold individually, allowing shops to build a complete cutter set by diameter and guide size as needed for their most common applications.