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A crossflow cylinder head is a cylinder head that features the intake and exhaust ports on opposite sides. The gases can be thought to flow across the head. This is in contrast to reverse-flow cylinder head designs that have the ports on the same side.
Crossflow heads use overhead valves, but these can be actuated either by overhead camshafts, or by a valve-train, which has the camshafts in the cylinder block, and actuates the valves with push rods and rockers.
Crossflow cylinder head, with twin overhead cams
Components of a valve-train with the valves on the left, touching the rockers, which in turn are touching the push rods that ride on the cams in the lower right.
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