* The "350" is a displacement, not a model: The "350" refers to the cubic inch displacement of the engine, not a specific engine model name.
* Many variations: Chevrolet produced a variety of engines with a 350 cubic inch displacement across many years.
* Early Development: While the "350" name wasn't common initially, the roots of the engine can be traced back to 1967 when Chevrolet introduced the 327 cubic inch block, which was later enlarged to 350 cubic inches.
So, to answer your question in a practical way:
* 1967 is considered the starting point: This is when the 327 block was introduced, which eventually led to the development of the 350.
* 1968-1969: 350 cubic inch engines began appearing in various Chevrolet vehicles, but it wasn't until the 1970s that the "350" became widely recognized and associated with high-performance muscle cars.
Let me know if you'd like more specific information about a particular 350 engine, like a certain model year or application.