The ZZ6 includes high-flow, fast-burn style aluminum cylinder heads with large intake runners. High-rpm beehive-style tapered valve springs with smaller valve spring retainers have reduced mass. There is much more to this engine than that. Learn more at Chevy's link.
Chevy will announce availability of the new engine at SEMA in November (members of GM-trucks.com plan to attend). Chevy will introduce base versions and also a turn-key version of the ZZ6 including a carburetor, an air cleaner that matches the unique valve covers, the starter, distributor, alternator and additional accessories such as the air conditioning compressor and front-end accessory drive system.