What year is my ford 4 cylinder block RF-E37E-6015-BA?

The casting number RF-E37E-6015-BA doesn't directly indicate the year. Ford casting numbers are complex and don't contain a year code in a readily decipherable format like some other manufacturers. To determine the year of your Ford 4-cylinder engine block, you'll need to look for additional information, such as:

* Vehicle Identification Number (VIN): The VIN, found on your vehicle's dashboard or doorjamb, will be the most reliable way to determine the model year. You can then cross-reference that with Ford's records or online resources to confirm the engine's year.

* Engine stamping on other engine parts: Other parts of the engine (like the head or intake manifold) might have casting numbers or date codes that could help narrow down the year.

Without additional information beyond the block casting number, it's impossible to definitively determine the year of manufacture.