
The 351W is a Windsor engine produced by Ford. It can be stroked to different sizes, with the most popular options being the 393 and 408. The 427 stroker is also an option, but less common. The maximum stroke size for a stock 351W block is around 4.15, and the block can be bored out to around 4.030-4.040.
There are also options to stroke the 351C engine, with common sizes including 3.625, 3.75, 3.85, and 4.0 strokes.
Characteristics | Values |
---|---|
Maximum stroke | 4.15" |
Maximum bore | 4.155 |
Maximum cubic inches | 454 |
What You'll Learn
- A 427 stroker may be too much for a stock block to handle
- A 4.15 bore is the limit for a stock production block
- A 408 stroker is a more popular option than a 427
- A 393 stroker can be created with a 3.85 stroke crank, deep-dish 302 pistons, and 351W rods
- A 408 stroker requires different rods to clear the oil pan rail and custom pistons
A 427 stroker may be too much for a stock block to handle
The stock 351W rods can be used in a 393 stroker, which is a relatively simple modification. However, for a 408 stroker and larger, different rods are needed to clear the oil pan rail, and custom pistons are required. The Ford Racing aftermarket blocks can accommodate a larger bore and stroke for a 427, but this requires additional modifications and custom parts.
The increased power of a 427 stroker can also put more stress on other components of the vehicle, such as the transmission, differential, brakes, and cooling system. It is important to consider the overall setup and requirements of the vehicle when deciding on the engine configuration.
Additionally, the rod ratios and piston side loads in a production block can be too high for longevity. It is recommended to use an aftermarket block, such as a Dart or FFRP block, for a 427 stroker to ensure durability and performance.
In summary, while it is possible to build a 427 stroker from a 351W, it may be more cost-effective and reliable to opt for a smaller stroker or an aftermarket block. The increased power and complexity of a 427 stroker may also require additional modifications and custom parts, both for the engine and other vehicle components.
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A 4.15 bore is the limit for a stock production block
The Ford 351W engine has a factory bore size of 4.000 inches. This means that the diameter of each cylinder in the engine block is 4.000 inches. The engine also has a stroke of 3.500 inches, which refers to the distance that the piston travels inside the cylinder.
It is possible to increase the displacement of an engine by increasing the bore size or the stroke. This process is known as "stroking" the engine. However, there are limits to how much the bore size can be increased, as the cylinder walls must be thick enough to support the pressure of the combustion process.
For a stock production block, the limit for the bore size is 4.15 inches. This means that the cylinder walls must be at least 0.15 inches thick to support the pressure of the combustion process. If the cylinder walls are thinner than this, there is a risk of the cylinder walls cracking or failing due to the high pressures and temperatures inside the cylinder.
Increasing the bore size of an engine can have several benefits, including increasing the displacement and power output of the engine. However, it is important to note that stroking an engine also has some potential drawbacks. For example, increasing the bore size can reduce the thickness of the cylinder walls, which can affect the engine's durability and reliability. Additionally, stroking an engine can also increase the piston speed, which can lead to increased wear and tear on the engine components.
As such, it is important to carefully consider the benefits and drawbacks of stroking an engine before making any modifications. It is also crucial to ensure that any modifications are done correctly and safely, as improper modifications can lead to engine damage or failure.
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A 408 stroker is a more popular option than a 427
The 408 stroker is a more popular option than the 427 for several reasons. Firstly, the 427 stroker requires more modifications to the block, such as notching, which increases the price. The 4.15" stock production block can handle the 408 stroker, but the 427 may be too much for the block. The 408 stroker kit is also very popular because it includes a forged crank, which is a more durable option.
The 408 stroker is also favoured due to its reliability and performance. It is considered a better race motor and more durable than the 427. The 427, on the other hand, is known as a "torque monster" for a street car. The larger stroke of the 427 can lead to frequent "refreshing" of the motor, whereas the 408 stroker is less likely to require such maintenance.
Additionally, the 408 stroker has better piston wall clearance. The 427's connecting rod can hit the cam, requiring clearancing of the rods, which is not needed for the 408. The 408 stroker also has a more favourable rod angle than the 427, which is considered "way too much" by some.
In terms of power, the 408 and 427 strokers can produce similar power outputs given the same modifications. However, the 427 is at the limit of displacement for the stock block, and pushing it further may lead to reliability issues. The 408 stroker, on the other hand, strikes a balance between displacement and reliability.
Therefore, the 408 stroker is a more popular option due to its ease of assembly, reliability, performance, and power capabilities, all while being less likely to require frequent maintenance compared to the 427.
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A 393 stroker can be created with a 3.85 stroke crank, deep-dish 302 pistons, and 351W rods
A 393 stroker can be created with a 3.85-inch stroke crank, stock 351W rods, and 302 pistons. The 302 pistons need to be "deep-dish" and have a height of 1.6 inches. This combination will result in a slightly smaller engine than a full 393, as the block is standard bore.
The 393 stroker is a popular choice for those wanting more power from their Ford engines, as it offers a significant increase in displacement and torque for a relatively low cost. It is possible to create a 393 stroker using stock parts from Ford, but it is important to ensure that all clearances are checked and the bottom end is balanced to reduce vibration and extend the life of the engine.
When building a 393 stroker, it is also important to consider the compatibility of all the parts being used. For example, GT40 heads may not provide enough airflow for a 393 stroker, and flat-top pistons may result in too high of a compression ratio for pump gas. It is also recommended to use a stroker crank, as the stock 351W crank will not achieve the desired stroke.
A 393 stroker can be a cost-effective way to increase the performance of a Ford engine, but careful planning and parts selection are necessary to ensure a successful build.
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A 408 stroker requires different rods to clear the oil pan rail and custom pistons
The 408 stroker kit for a 351W engine requires a few modifications to fit in the engine bay. The most notable change is the need for different connecting rods to clear the oil pan rail. The stock 351W rods are too long and will interfere with the oil pan, so aftermarket rods with a shorter length are necessary to avoid this issue. Additionally, custom pistons are required as the longer stroke of the 408 kit increases the distance the piston travels in the cylinder, which means the piston extends further towards the oil pan.
The 408 stroker kit is a popular option for those looking to increase the displacement of their 351W engine. The kit typically includes a forged crankshaft with a longer stroke, requiring custom pistons and connecting rods to accommodate the increased stroke length. While the stock 351W crankshaft can be used for a smaller displacement increase, such as a 393 cubic inch build, the 408 kit requires a longer stroke crankshaft that won't fit without the appropriate connecting rods and pistons.
When choosing connecting rods for a 408 stroker build, it is important to consider the clearance between the rods and the oil pan rail, as well as the cylinder walls. Some combinations of crankshafts and rods may require modifications to the cylinder block to ensure proper clearance. It is always a good idea to perform a trial assembly of the rotating assembly to check for any potential clearance issues before final installation.
Custom pistons are also required for a 408 stroker build to accommodate the longer stroke. The pistons need to be designed for the specific combination of bore and stroke to ensure proper clearance within the cylinder and with the connecting rods. Additionally, the compression ratio and dish volume of the pistons can be customised to match the desired engine performance and compression ratio.
While the 408 stroker kit for the 351W engine requires some additional components and modifications, it is a popular choice for those seeking increased displacement and performance. The longer stroke of the 408 kit provides a significant increase in displacement, resulting in more torque and power potential. With careful parts selection and assembly, a reliable and powerful 408 stroker engine can be achieved.
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Frequently asked questions
The most popular stroker size for a 351W is 408 cid.
The biggest stroker size for a 351W is 454 cid.
The smallest stroker size for a 351W is 377 cid.