But, Nissan had other ideas and engineered the RB26 with touring car races in mind, leaving loads of headroom for higher output degrees.The RB engine relatives contains one overhead camshaft (SOHC) and double overhead camshaft (DOHC) engines.[four] Both of those SOHC and DOHC versions have an aluminium head. The SOHC variations have 2 valves per cy