[Moppie]

The RB is a simple development of the L series in 240z, which is an exact copy of a Mercedes engine developed I think in the early 60s, and used right up untill I belive the late 70s.

While the RB is a "new" engine from the L series, its shares enough of the basic design that things like the enigne mounts are in roughly the same place, and the engine is roughly the same size.