* Engine Variations: The S54 engine was used in various BMW models with minor differences in its design, including the M3 (E46) and Z4 M. These variations could affect its weight slightly.
* Accessories: The weight can vary depending on what accessories are included. For example, an engine with the intake manifold, exhaust manifold, and other ancillary components will weigh more than just the bare block.
* Manufacturer Sources: Different sources may provide different weight estimates, and some may be more accurate than others.
However, a general ballpark figure for the weight of a BMW S54 engine, including its accessories, would be around 400-450 pounds (180-200 kg).
If you need a precise weight, you would need to consult a technical manual for the specific S54 model you're interested in.
