The cylinder heads are cast of lightweight aluminum and feature four valves per cylinder along with a VTEC ® variable valve timing system with variable lift and timing for the intake valves. (topspeed.com)
Nissan uses its latest valve - timing technology on it, which includes variable lift on the intake valves. (cnet.com)
Honda's celebrated i - VTEC variable lift - and - timing valve technology is tuned here for a broad and powerful midrange. (hybridcars.com)