Here's a more specific breakdown:
* 1971-1978: The E350 was introduced in 1971, and the 351 Cleveland engine was offered as an option.
* 1979-1991: The 351 Windsor engine was the primary option, replacing the Cleveland.
* 1992-present: While the E350 continued to be produced, the 351 engine was phased out in favor of other V8 engines and eventually replaced by the 5.4L Triton V8.
Note: You may find some E350s with the 351 engine in later years, but they would be less common and likely be older models with modified engines.
It's important to clarify whether you are looking for the 351 Cleveland or 351 Windsor. The year range will vary depending on which specific engine you are interested in.
