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The four valves per cylinder two intake and two exhaust were actuated by roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms which actuated the valves. 1279 Followers 367 Following 35 Posts - See Instagram photos and videos from Abdou A. Epingle Sur Men S Watches Relojes The FA20D engine had an aluminium alloy cylinder head with chain-driven double overhead camshafts.