History
Ford produced the small block Windsor family of engines from 1961-2000. There were many variations available throughout the years.
Visual Difference
The main difference between the blocks was the Deck Height . The 351 blocks were as much as 1.300 in. taller to allow for a longer Stroke .
You can spot the difference pretty easily by looking at the front of the engine.
On a 302 (or smaller c.i.d.) blocks, the distributor mount is almost flush with the top of the block (where the intake sits). The water passages are also right at the top of the block (where the heads sit). The image below shows a 302 block.
A 351W block is taller. So, the distributor mount is below the block surface where the intake sits. There is also more space between the water passages and the cylinder heads. The image below shows a 351W block.
Other Differences
| Engine Size | Bore | Stroke | Deck Height |
| 221 c.i.d. / 3.6L | 3.500 in. | 2.870 in. | 8.201 - 8.210 in. |
| 255 c.i.d. / 4.2L | 3.680 in. | 3.000 in. | |
| 260 c.i.d. / 4.3L | 3.800 in. | 2.870 in. | |
| 289 c.i.d. / 4.7L | 4.000 in. | 2.870 in. | |
| 302 c.i.d. / 5.0L | 3.000 in. | ||
| 351 c.i.d. / 5.8L | 3.500 in. | 9.480 - 9.503 in. |