This valve seat cutter allows you to enlarge the cylinder head spring pocket to 1.350" outer diameter while reducing the outer diameter of the valve guide to .775". Ideal for installing single springs on GM Vortec head.
Cuts cylinder head spring seats to 1.350" diameter / Cuts to .775" inner diameter. For installing larger springs and hardened spring seats on GM Vortec heads. Requires the use of an arbor/pilot, which are available for 5/16", 11/32" and 3/8" valve stem sizes.
