The RB26 contains a Forged iron block by having an aluminum alloy head. The valve coach is often a DOHC with twin-cams and 4 valves for every cylinder for a complete of 24 valves on the engine. The RB26 does not have variable valve timing (VVT), which Nissan wouldn’t introduce of their engines until finally the early-‘90s.Wait what? A Holden? S