It pro­vides clearance for the all-important turbo­charger. Chevrolet has pirated the turbo mo­tor from Buick. It is the same V-6 that came originally to life for the Riviera and the Cen­tury ...
There are currently four variations of the Nissan RB engine: RB20, RB25, RB26, and RB30. The RB20 is the first iteration that was made famous by powering the Nissan Skyline GT-R, aka Godzilla.