The cylinder head is manufactured from a light, sturdy aluminum alloy with great cooling effectiveness. Camshafts are made of specially cast steel and therefore are driven by a timing belt. The 2JZ-GTE motor is provided with four valves for each cylinder: two consumption valves and two exhaust valves. Amazing company. https://jdm-toyota-2jz-gte-vvti-f84913.tokka-blog.com/28307625/details-fiction-and-jdm-toyota-2jz-gte-vvti-for-sale-built-2jz-gte