Valve Spring Seat Cutter, 0.560 in OD Guide, 1.680 in OD Valve Seat, Steel / Carbide, Universal, Each. Most people are familiar with Comp Cams as one of the premiere performance camshaft manufacturers. However, Comp Cams produces top-quality components for every aspect of your engine’s valve train components, with race-proven results for top racing teams from the NHRA, NASCAR, and more. SPRING SEAT CUTTER 1.680. 0.37 lbs 0.17 kg. 6.2 in 15.75 cm. 3.5 in 8.89 cm. 1.25 in 3.18 cm.