The world of classic Ford engines is a fascinating labyrinth, especially when delving into the intricacies of the FE series. While many enthusiasts are familiar with the iconic 289 and 427 small-block Fords, the larger FE (Ford Edsel) big-block engines, including the 351 and 352 cubic-inch variants, often present a unique set of challenges and rewards. This article aims to clarify some of the confusion surrounding the Ford 351 and 352 engines, particularly the often-misunderstood casting numbers and their implications for performance and value. We will explore the horsepower differences, compare them against other popular engines like the Chevrolet Small Block 350, and delve into the technical specifications of the Ford 352.
The Casting Number Conundrum: 351 vs. 352
The common misconception revolves around the casting number "352" often found on the front of the engine block. While nearly all factory-produced Ford 352 engines will bear this casting number, its presence isn't a foolproof identifier. The issue arises because engine swaps and rebuilds were (and still are) common practices. Simply seeing "352" cast on the block doesn't definitively confirm the engine's internal specifications, particularly bore and stroke. A 351 block could easily have been modified, or even completely rebuilt, to accept 352 components, rendering the external casting number misleading.
Therefore, accurately identifying a 351 versus a 352 engine requires a more thorough inspection. This necessitates removing the cylinder heads to measure the bore and stroke directly. Only then can you definitively determine the engine's true displacement. This is crucial, as the internal dimensions dictate the engine's inherent potential and influence its performance characteristics. This underlines the importance of a thorough inspection before purchasing a used engine, especially when dealing with older, potentially modified units. A quick visual check alone can be dangerously insufficient.
Ford 352 HP vs. 351 HP: A Horsepower Head-to-Head
The horsepower output of both the 351 and 352 engines varied significantly depending on the year of production, the specific application (truck, car, etc.), and the level of modification. Factory horsepower figures are often elusive and can be unreliable due to variations in testing methodologies throughout the years. However, we can make some general comparisons.
Generally speaking, a stock 352 cubic inch engine produced slightly more horsepower than a stock 351. The difference, however, wasn't dramatic, typically ranging from a few to perhaps twenty horsepower depending on the specific year and configuration. This marginal difference highlights the importance of considering other factors, such as the engine's condition, modifications, and intended application, rather than solely focusing on the nominal displacement.
The true performance difference between a 351 and a 352 is more nuanced than a simple horsepower comparison. Factors such as the camshaft profile, carburetor size, intake manifold design, exhaust system, and overall engine tuning play a more significant role in determining the final power output. A well-tuned 351 can easily outperform a neglected or poorly maintained 352.
Ford 352 HP vs. SBC 350: A Cross-Brand Comparison
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