Comprehensive Guide to the 428 CJ Engine: Specs, Features, and FAQs
428 cj engine for sale, The 428 Cobra Jet (CJ) engine is one of the most iconic and sought-after engines in the world of classic American muscle cars. Introduced by Ford in 1968, the 428 CJ became a powerhouse, dominating the streets and drag strips during the muscle car era. If you’re considering purchasing a 428 CJ engine, this guide provides essential information, including specifications, features, history, and answers to frequently asked questions.
History of the 428 CJ Engine
Ford developed the 428 Cobra Jet in response to growing demand for high-performance vehicles. Derived from the FE (Ford-Edsel) engine family, the 428 CJ combined power and affordability, making it a favorite among muscle car enthusiasts. Debuting in the 1968 Ford Mustang, the 428 CJ was instrumental in making the Mustang a muscle car legend.
Notable cars powered by the 428 CJ include:
- 1968-1970 Ford Mustang GT and Mach 1
- 1969-1970 Ford Torino Cobra
- 1969-1970 Mercury Cougar Eliminator
- 1969 Mercury Cyclone CJ
Specifications of the 428 CJ Engine
| Feature | Details |
|---|---|
| Engine Family | Ford FE V8 |
| Displacement | 428 cubic inches (7.0 liters) |
| Bore x Stroke | 4.13 in × 3.98 in (104.9 mm × 101.1 mm) |
| Compression Ratio | 10.6:1 |
| Horsepower | 335 hp (gross rating) |
| Torque | 440 lb-ft |
| Carburetor | Holley 735 cfm 4-barrel |
| Block Material | Cast Iron |
| Head Material | Cast Iron |
| Valve Configuration | OHV (Overhead Valve), 2 valves per cylinder |
| Redline | 5,800 RPM |
| Fuel Requirement | High-octane gasoline |
Unique Features of the 428 CJ Engine
Ram-Air Induction
The optional Ram-Air setup featured a functional hood scoop, enhancing cold air intake for better performance.
Heavy-Duty Components
Ford equipped the 428 CJ with heavy-duty parts, including a reinforced crankshaft, connecting rods, and pistons to handle high stress.
Oil Cooler and Modified Exhaust
Designed to support sustained high-performance driving, the engine included an external oil cooler and a high-flow exhaust system.
Cobra Jet Heads
Unique cylinder heads with larger valves improved airflow and combustion efficiency.
Purchasing a 428 CJ Engine: What to Consider
When buying a 428 CJ engine, ensure the following:
- Authenticity: Confirm the engine’s originality by verifying casting numbers, date codes, and VIN stamps. Common casting numbers include C6ME-A or C7ME-A for blocks.
- Condition: Inspect for damage, wear, or cracks. Rebuilt engines often provide reliability, but an original, unrestored unit may hold more value for collectors.
- Documentation: Provenance is essential, particularly for engines linked to specific high-value vehicles.
- Intended Use: Determine if you’re buying the engine for restoration, performance upgrades, or collection purposes.
FAQs About the 428 CJ Engine
1. How much does a 428 CJ engine cost?
Prices vary significantly based on condition, originality, and completeness.
- Original unrestored engines: $10,000–$20,000
- Rebuilt engines: $15,000–$30,000
- Fully restored engines: $25,000+
2. How can I identify a real 428 Cobra Jet engine?
Check the block casting numbers, heads, and intake manifold. Look for CJ-specific parts like the Holley carburetor (R-4129) and the nodular iron crankshaft. The presence of a “C” or “J” in the VIN indicates a Cobra Jet-equipped vehicle.
3. What vehicles originally came with the 428 CJ?
The 428 CJ was factory-installed in various Ford and Mercury models, including:
- Ford Mustang Mach 1
- Ford Torino GT
- Mercury Cougar XR7
- Mercury Cyclone GT
4. What kind of fuel does the 428 CJ require?
The engine requires high-octane gasoline, as it was designed for performance and higher compression ratios.
5. Can the 428 CJ be modified for more power?
Yes, the 428 CJ has excellent aftermarket support. Upgrades include performance camshafts, aluminum heads, and modern electronic fuel injection (EFI) systems.
6. How reliable is the 428 CJ engine?
The 428 CJ is renowned for its durability, provided it is maintained properly. Using quality oil, regular tune-ups, and proper storage are key.
7. Where can I find a 428 CJ engine for sale?
Popular sources include:
- Online marketplaces (e.g., eBay Motors, Craigslist)
- Classic car forums and enthusiast groups
- Specialty shops that rebuild or sell vintage Ford engines
- Auctions and car shows focused on muscle cars
8. Can I use the 428 CJ engine in modern vehicles?
While possible, retrofitting the 428 CJ into a modern vehicle requires significant modifications, particularly for mounts, electronics, and transmission compatibility.
Conclusion
The 428 Cobra Jet engine remains a symbol of American muscle car performance, blending power, heritage, and collectability. Whether you’re restoring a classic Mustang or building a unique custom project, owning a 428 CJ engine connects you to a rich automotive history. By understanding the engine’s specs, features, and nuances, you can make an informed purchase and enjoy the unmatched thrill of this legendary V8.
If you’re in the market for a 428 CJ engine or simply want to learn more, feel free to ask additional questions or explore dedicated online communities for expert advice.
