COMP Cams valve spring seat-cutting tools allow you to machine the cylinder head for the correct diameter valve spring. This will allow you to install larger springs and hardened spring seats. They will require the use of an arbor/pilot (sold separately).

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COMP Cams Valve Spring Seat Cutter, Spring Seat Cutter, 1.580 in., Cuts Guide, 0.560 in.

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Powerhouse Valve Guide Cutter .485

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Powerhouse Cutting Tool, Arbor/Pilot for Cutters, 5/16 in. diameter, Arbor, Each

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