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Most high performance engines today require the use of larger-than-stock diameter valve springs. This 1.680 inch Spring Seat Cutter from COMP Cams will allow the engine builder to machine the cylinder head to the proper size for your spring. Each cutter requires the use of an arbor/pilot, which are available in three different sizes. 1.680 inch O.D. .630 inch Cuts Guide
Cuts guide to .630 inch
Cuts spring seat to 1.680 inch O.D.
Other seat cutters available in many sizes from 1.350 inch to 1.810 inch O.D.
Part number 4722