The RB26 contains a cast iron block using an aluminum alloy head. The valve educate is really a DOHC with twin-cams and 4 valves for each cylinder for a total of 24 valves to the engine. The RB26 doesn't have variable valve timing (VVT), which Nissan wouldn’t introduce of their engines right up until the early-‘90s.Wait around what? A Holden? O