FORD FOMOCO FACTORY ORIGINAL OEM B7A-6310-A Engine Oil 55-56-57-58 V8 272 292 312 Crankshaft Slinger 56-58

( Brand: Ford Fomoco Factory Original Oem ), ( Manufacturer Part Number: B7A-6310-A ), ( Part Type: Oil Engine Crankshaft ), ( Ipn: 55 56 57 58 ), ( Oe/oem Part Number: Oil Slinger Plate ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review FORD FOMOCO FACTORY ORIGINAL OEM V8 Engine 272 292 312 Crankshaft Oil Slinger fits 1955–1958

The **Ford B7A-6310-A V8 Engine Crankshaft Oil Slinger** is a meticulously engineered, high-performance component designed specifically for the iconic **1955 1958 Ford V8 engines** (including the **56-58 models**) with displacement options of **272, 292, or 312 cubic inches**. This aftermarket oil slinger ring serves as a critical lubrication and sealing element, positioned between the crankshaft and the engine block to prevent oil leakage while ensuring smooth operation of the rod bearings. Crafted from high-quality **chrome-plated steel**, this slinger is built to withstand the intense pressures and high RPM demands of these legendary powerplants, which were renowned for their durability and raw torque in classic muscle cars, trucks, and performance applications.

The **B7A-6310-A** oil slinger is a precision-machined replacement designed to fit seamlessly within the **Ford Y-block and early Thunderbird V8 engine families**, offering an upgrade over the stock component to reduce oil consumption, minimize sludging, and extend the life of critical engine internals. Its **split-ring design** allows for easy installation without requiring disassembly of the crankshaft, making it a convenient yet effective solution for restorers, tuners, and enthusiasts seeking to optimize their engine s longevity and performance. Whether used in a **restored 1956 Ford Fairlane, a high-mileage 1957 F-100, or a modified 1958 Thunderbird**, this oil slinger ensures that oil is evenly distributed to the rod bearings while preventing excessive wear on the crankshaft journals.

For those maintaining or rebuilding these classic engines, the **B7A-6310-A** is an essential part of a complete rebuild kit, offering compatibility with **Ford s early V8 designs** that relied on reliable oil control to prevent catastrophic failure. Its **chrome finish** resists corrosion and wear, making it ideal for both short-term and long-term use in engines that see heavy duty or high-performance applications. Whether you're working on a **daily driver, a show car, or a project vehicle**, this oil slinger is a small but vital component that contributes to the overall health and performance of one of Ford s most legendary engine families.

### **Pros and Cons of Buying a Ford B-Series 7.5L (B7A-6310-A) V8 Engine (1955 1958)**

The **Ford B-series 7.5L V8 (B7A-6310-A)** is a classic engine known for its durability, simplicity, and historical significance in American muscle cars. Below is a detailed breakdown of its advantages and drawbacks, followed by a conclusion and recommendation.

---

### **Pros**

1. **Proven Reliability and Durability**

- The B-series V8 was designed for heavy-duty applications, including trucks, buses, and early muscle cars. Many examples have lasted well over 200,000 miles with basic maintenance.

- The **cast-iron block and head** are robust, making them resistant to warping and cracking compared to aluminum alternatives.

- **Simple design** with fewer moving parts than modern engines, reducing long-term failure risks.

2. **Availability of Parts and Aftermarket Support**

- As one of the most popular Ford V8s of the 1950s, **parts are widely available**, including OEM replacements, aftermarket upgrades, and reproduction components.

- **Common modifications** (e.g., big-block swaps, performance camshafts, high-flow heads) are well-documented, making upgrades accessible.

- **Restoration and rebuild kits** are widely sold, making repairs straightforward for DIYers.

3. **Classic Muscle Car and Truck Appeal**

- The **B-series V8** is iconic in early American performance culture, particularly in **Ford Thunderbirds, Fairlanes, and F-100 trucks**.

- **Nostalgia factor** owning or restoring one is attractive to enthusiasts who appreciate mid-century automotive history.

- **Potential for high resale value** if well-preserved, especially in classic car markets.

4. **Modular and Upgradeable**

- The **crankshaft oil slinger** (part of the lower end) is a simple component that can be replaced or upgraded without major disassembly.

- **Big-block compatibility** many owners swap in **Ford 351W, 390, or 428 Windsor** blocks for more power while retaining the original cylinder heads.

- **Performance potential** with the right mods (cams, headers, fuel system upgrades), it can produce **300 500 HP** in modern applications.

5. **Lower Cost of Ownership (Compared to Modern Engines)**

- **Fuel efficiency is poor by today s standards** ( 12 15 MPG in a stock truck), but **repair costs are minimal** compared to modern turbocharged or high-tech engines.

- **No complex electronics** no ECUs, direct injection, or turbochargers to fail, making troubleshooting easier.

- **Cheap to rebuild** labor costs are low, and parts are affordable.

6. **Versatility in Applications**

- Works well in **restoration projects, hot rods, drag racing, and even modern builds** (e.g., lifted trucks, custom muscle cars).

- Can be **swapped into non-Ford vehicles** (e.g., Chevy trucks, Jeeps) with minimal modifications.

---

### **Cons**

1. **Poor Fuel Economy and Emissions Compliance**

- **Stock displacement (272 312 ci) is thirsty**, especially in modern applications where fuel efficiency is a concern.

- **Modern emissions regulations** make it difficult to run stock or even mildly modified versions in many areas without modifications (e.g., EGR deletion, catalytic converter bypass).

- **Not street-legal in some regions** without significant alterations, particularly in California or other emissions-restrictive states.

2. **Maintenance Requirements**

- **Regular valve adjustments** are necessary (unlike modern OHV engines with hydraulic lifters).

- **Rod bearings and main bearings** wear over time and require **frequent inspection** (every 50,000 100,000 miles).

- **Water pump and timing chain** failures are common these are **critical components** that must be replaced proactively.

- **Head gasket failures** can occur if the engine overheats or is modified aggressively.

3. **Noise and Vibration**

- **Loud exhaust and intake sounds** not ideal for quiet street use.

- **Vibration at idle** due to the **long crankshaft and heavy rotating assembly**, which can be mitigated with a **vibration damper or harmonic balancer**.

- **Rough idle** in stock form, though this improves with a **performance camshaft**.

4. **Weight and Size**

- **Heavy ( 600 700 lbs)** not ideal for lightweight hot rods or modern performance builds where weight matters.

- **Large physical size** makes installation tricky in some chassis, requiring **custom mounts or frame modifications**.

5. **Limited Modern Performance Without Major Mods**

- **Stock power is modest** ( 150 200 HP in early models, 250 HP in later 312s).

- **To achieve serious power (300 HP), significant modifications are needed** (high-flow heads, forced induction, fuel system upgrades), which can be expensive.

- **Not as efficient as modern engines** even with mods, **fuel economy remains poor** compared to turbocharged or hybrid alternatives.

6. **Potential for Hidden Issues**

- **Cast-iron blocks can crack** if overheated or improperly cooled.

- **Rod bearing failures** are a common failure point, especially in high-mileage examples.

- **Timing chain stretch** can cause **valve train issues** if not addressed.

- **Stock electrical systems** (points, distributors, vacuum advance) are **prone to failure** and may require modern replacements.

7. **Restoration Can Be Time-Consuming**

- **Full restoration** (block, heads, cam, rods, bearings) can take **hundreds of hours** of labor.

- **Finding a complete, clean engine** can be expensive many used examples have **hidden damage** (cracks, warped decks, worn journals).

---

### **Conclusion**

The **Ford B-series 7.5L V8 (B7A-6310-A)** is a **fantastic engine for enthusiasts who prioritize nostalgia, simplicity, and classic muscle car appeal**. It is **durable, easy to work on, and offers endless modification potential**, making it ideal for **restoration projects, hot rods, and drag racing**. However, it is **not the best choice for daily drivers** due to its **poor fuel economy, emissions restrictions, and high maintenance needs**.

If you are **passionate about classic American engines, have the time and budget for maintenance, and don t mind its quirks**, this engine is an **excellent investment**. On the other hand, if you need **modern efficiency, low emissions compliance, or minimal upkeep**, a **modern V8 or turbocharged engine** would be a better fit.

---

### **Recommendation**

- You are restoring a **1950s Ford (Thunderbird, Fairlane, F-100)** and want **authentic power**.

- You enjoy **DIY mechanical work** and don t mind **regular maintenance**.

- You plan to **modify it for performance** (big-block swap, headers, camshaft) and don t mind **loud, thirsty operation**.

- You find a **well-documented, clean example** (preferably with **known history**) to avoid hidden issues.

- You need a **modern, efficient daily driver** with low emissions compliance.

- You **don t have time or mechanical skill** for regular upkeep (bearings, valves, water pump).

- You are **not willing to modify it** for emissions or performance (e.g., EGR deletion, fuel injection).

- You are looking for **high fuel economy or minimal noise** this engine is **not for that**.

**Classic car restoration** (1955 1958 Ford)

**Hot rod or drag racing** (with proper mods)

**Truck or bus restoration** (for historical accuracy)

**DIY enthusiast project** (if you enjoy working on old engines)

- **Ford 289/302 Windsor (1961 )** More modern, better fuel economy, still reliable.

- **Chevy 265/283 (Blue Flame)** Similar simplicity, slightly better emissions compatibility.

- **Modern V8 (LS, GM EcoTec, Ford EcoBoost)** Better fuel efficiency, emissions-friendly, but less nostalgic.

---

The **Ford B7A-6310-A V8 is a fantastic engine for the right owner** one who appreciates its **history, durability, and mod potential**. If you are **committed to its care and enjoy the classic muscle car experience**, it is a **great purchase**. However, if you need **modern convenience or emissions compliance**, look elsewhere. **Buy with your eyes open, inspect thoroughly, and be prepared for maintenance.**

Details:

Believed to be correct for 1955 through 1958 V8 292 312 engines. Ford FE engine crankshaft oil slinger.

part #: b7a6310 prices

• $14.95-$223.84

specifications cranshafengin:

• for makes: Ford
• for years: 1955-1958
• brand: Ford Fomoco Factory Original Oem
• mpn: B7a-6310-a
• part type: Oil Engine Crankshaft
• ipn: 55 56 57 58
• oe/oem part number: Oil Slinger Plate
• vintage part: Yes
• country of origin: United States

payments cranshafengin:

• credit card: Diners-club
• wallet: Apple-pay
• other

general cranshafengin:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

shipping cranshafengin:

• type: Fixed
• carrier: USPS
• service: USPS First Class, USPS Priority Mail
• transit: 2-6 Days
• class: Standard, Expedited
• cost: $0.00

seller cranshafengin:

• rating: 99.7%
• city: Mira Loma, California
• # reviews: 6930

returns cranshafengin:

• time: 60 Days
• policy: Returns Accepted
• paid by: Buyer

offer cranshafengin:

• options: Ship-to-home
• started: June 9, 2026
• availability: In Stock
• best offers: True
• quantity: 1
• sold: 0

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