The cylinder head is manufactured from a light, solid aluminum alloy with great cooling performance. Camshafts are made of specifically Forged metal and are pushed by a timing belt. The 2JZ-GTE engine is equipped with four valves for every cylinder: two ingestion valves and two exhaust valves. Issue as pictured. https://andresucdda.tblogz.com/jdm-toyota-2jz-gte-vvti-for-sale-built-2jz-gte-no-further-a-mystery-42340330