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Nationwide engine builders are flooding the valve covers with oil to reduce both damaging harmonic vibrations and heat in the valvesprings. But spring oilers are still necessary for startup. The new RO7 valve covers integrate the spring oilers right into the casting. Oil enters the gallery from a hole in the cylinder head. After entering the valve cover (upper corner) it travels under pressure to the spring oiler gallery which has fittings to direct a fine stream of oil to each valvespring.