* Windsor 351: This is probably the most commonly referenced 351. It was a small-block V8 known for its relatively compact size and wide range of applications, from passenger cars to trucks and even some boats. Different versions existed with varying power outputs depending on the year and specific application.
* Cleveland 351: This was a larger, more powerful, and higher-performance version of the 351. It featured a canted valve design and was favored for its strong torque and high-revving capabilities. It was less common in production vehicles than the Windsor.
It's important to specify which 351 you mean when discussing it, as their characteristics differ significantly. Knowing the application (car model, year, etc.) will help determine the exact type of 351 engine.
