What year is the engine for casting number r90209802?

The casting number R90209802 doesn't directly correspond to a specific year. Casting numbers are used to identify the physical block, but the engine's year of manufacture is determined by a variety of factors including the vehicle's production date, and sometimes additional engine codes stamped elsewhere on the engine.

To determine the year, you need more information, such as:

* The vehicle it came from: Make, model, and year of the vehicle will greatly narrow down the possibilities.

* Other engine codes: Look for other markings on the engine block or on a tag attached to it. These often provide crucial date codes.

Without this additional context, it's impossible to determine the engine's year of manufacture.