These tools from COMP Cams will allow machining of the cylinder head to the proper size for your spring. Each cutter requires the use of an arbor/pilot, which is available in three different sizes. These arbor/pilots also will work with the valve guide cutters used for shortening the guide
for a high lift cam or installing a COMP Cams Teflon seal for oil control.

• Seat cutters available in many sizes from 1.320"-1.810" O.D
• Valve guide cutters available to cut guide to .446", .494", .500", .530" or .625"
• Arbors/pilots available for 5/16", 11/32", 3/8" and 7mm valve stem diameter

Product Reviews for CO4730 - COMP