The cylinder head is made from a light, potent aluminum alloy with superior cooling effectiveness. Camshafts are made of specifically Forged steel and are pushed by a timing belt. The 2JZ-GTE motor is supplied with four valves for each cylinder: two consumption valves and two exhaust valves. Issue as pictured. https://dallasppomj.bloggazza.com/27594490/the-greatest-guide-to-jdm-toyota-2jz-gte-vvti-for-sale-built-2jz-gte