The RB26 features a cast iron block using an aluminum alloy head. The valve prepare is really a DOHC with twin-cams and 4 valves for each cylinder for a complete of 24 valves on the engine. The RB26 does not have variable valve timing (VVT), which Nissan wouldn’t introduce in their engines till the early-‘90s.Keeping your RB26DETT engine is imp