COMP Cams 1.550" Spring Seat Cutter - Cuts Guide: .630" 38500310 Available with inner OR outer

Available with inner OR outer seam construction

1979-1988 GMC G3500

Late model GM

Not compatible with Vacuum/Boost gauges

1972-1972 Chevrolet C30 Pickup

COMP Cams 1.550" Spring Seat Cutter - Cuts Guide: .630" 38500310 Available with inner OR outerMost high performance engines today require the use of larger than stock diameter valve springs. This 1. 550" 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. This valve seat cutter allows you to enlarge the cylinder head spring pocket to 1. 550" outer diameter while reducing the