COMP Cams Spring Seat Cutter For GM VorCuts cylinder head spring seats to 1. 320" diameter Cuts to . 630" 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. Catalog User 1
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Cuts cylinder head spring seats to 1.320" diameter / Cuts to .630" 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.