The cylinder head is manufactured from a light, robust aluminum alloy with very good cooling performance. Camshafts are made of specifically Solid metal and are driven by a timing belt. The 2JZ-GTE motor is supplied with 4 valves per cylinder: two intake valves and two exhaust valves. Ailment as pictured. https://lukaspskjh.ivasdesign.com/50179862/jdm-toyota-2jz-gte-vvti-for-sale-built-2jz-gte-can-be-fun-for-anyone