The cylinder head is made of a light-weight, sturdy aluminum alloy with superior cooling efficiency. Camshafts are made of specially cast steel and therefore are driven by a timing belt. The 2JZ-GTE motor is supplied with 4 valves for each cylinder: two consumption valves and two exhaust valves. Wonderful service. https://donovanrttrp.rimmablog.com/27745984/a-simple-key-for-jdm-toyota-2jz-gte-vvti-for-sale-built-2jz-gte-unveiled