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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Powerhouse Valve Spring Seat Cutter, 1.320 in. Diameter, Carbide Cutting Tip, Cuts Guide Size 0.630 in, Each

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Powerhouse Cutting Tool, Arbor/Pilot for Cutters, 11/32 in. diameter, Arbor, Each

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COMP Cams Arbor/Pilot For Seat & Guide Cutters 5/16 in.

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