COMP Cams 4730CPG Arbor Pilot for Valve Seat and Guide Cutters 5/16 Inch

The COMP Cams 4730CPG is a precision arbor and pilot tool designed for use with valve seat and guide cutters on engines equipped with 5/16 inch valve stems. This essential engine building tool serves as both a guide pilot and arbor, ensuring accurate machining when installing larger-than-stock valve springs or performing cylinder head work.

Key Features:

• Designed for 5/16 inch (0.3125 inch) diameter valve stems
• Compatible with COMP Cams valve seat cutters and valve guide cutters
• Constructed from precision-machined steel for durability and accuracy
• Acts as both an arbor and pilot for proper tool guidance during machining operations
• Universal fit for cylinder heads requiring 5/16 inch valve stem applications

This arbor/pilot is required when using COMP Cams valve guide cutters (available in sizes from 0.425 inch to 0.625 inch diameter) and valve seat cutters (ranging from 1.320 inch to 1.810 inch O.D.). Professional engine builders and serious enthusiasts rely on this tool when upgrading to high-performance valve springs that require enlarged valve guide and seat machining. The arbor inserts into the original valve guide hole to provide a stable, centered cutting path for precision results.

Note: COMP Cams also offers arbor/pilots for 11/32 inch and 3/8 inch valve stem sizes to accommodate different engine applications.