351 Windsor:
* Block: A smaller, more compact block casting with a smaller bore spacing (4.00 inches). This leads to a more robust and generally stronger block.
* Cylinder Heads: Generally uses smaller combustion chambers and less aggressive porting than the Cleveland. This translates to a slightly lower potential for high RPM power but often better low-end torque. It was also easier and cheaper to manufacture heads for the Windsor.
* Crankshaft: Uses a smaller diameter crankshaft than the Cleveland, which contributes to greater durability at lower RPMs.
* Connecting Rods: Typically utilizes stronger connecting rods.
* Overall: Known for its robust construction, reliability, and relatively easy maintenance. Better low-end torque. Generally easier to find parts for.
351 Cleveland:
* Block: A taller deck height and larger bore spacing (4.00 inches, same as Windsor, but different casting). The Cleveland block is inherently weaker than the Windsor block, prone to cracking around the cylinder bores with high horsepower builds.
* Cylinder Heads: Features larger, more open combustion chambers and significantly more aggressive porting. This is designed for high RPM power and airflow, making it more suitable for high-performance applications. The heads are significantly more difficult to work with and require specialized tooling.
* Crankshaft: Uses a larger diameter crankshaft which is lighter, facilitating higher RPMs. This also makes it more prone to damage from excessive RPM or harsh usage.
* Connecting Rods: Generally less robust than the Windsor's.
* Overall: Known for its high-RPM power potential and its "screaming" performance. Less robust, requires more careful tuning and maintenance. Parts can be more difficult and expensive to find.
In short: The Windsor is a strong, reliable workhorse engine with good low-end torque, while the Cleveland is a high-performance engine designed for top-end power, but it comes with increased fragility. The choice depends entirely on the intended application; a Windsor is better suited for street use or mild modifications, while a Cleveland is generally better for racing or high-performance builds, albeit with increased risk of failure.
