The FA20D engine had an aluminium alloy cylinder head with chain- driven double overhead camshafts. 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). We did not find results for: verkaufen imac vorbereiten. trading umkehrsignale. The FA20D engine had an aluminium alloy cylinder head with chain- driven double overhead camshafts. Check spelling or type a new query.