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The Magnum R/T cylinder head is designed to be a bolt-on replacement for a Magnum small-block, but can easily be retrofitted to an earlier LA-series engine. The valvetrain bosses are setup to receive the Magnum 1.6:1 pedestal rockers, and like all Magnum engines, the valvetrain oils through the pushrods. Note the extra valve-cover boltholes. Magnums use ten bolts as opposed to the old five, and a machined rail to banish the traditional leaking valve covers.