304 Jeep Engine For Sale: Your Comprehensive Guide to an American Icon

304 Jeep Engine For Sale: Your Comprehensive Guide to an American Icon jeeps.truckstrend.com

The roar of a classic V8 engine is a symphony to the ears of any automotive enthusiast, and for Jeep aficionados, few sounds are as iconic as that of the AMC 304. This robust, torquey powerplant powered a generation of beloved Jeeps, embedding itself in the lore of off-roading and American engineering. If you’re looking to restore a vintage CJ, upgrade a less powerful model, or simply appreciate the mechanical heritage, finding a "304 Jeep Engine For Sale" can be the cornerstone of your next project.

This comprehensive guide will delve into everything you need to know about the AMC 304 V8, from its historical significance to the practicalities of acquiring one in today’s market. Whether you’re a seasoned mechanic or a budding enthusiast, understanding the nuances of this engine is key to a successful venture.

304 Jeep Engine For Sale: Your Comprehensive Guide to an American Icon

The Enduring Legacy of the AMC 304 V8

The AMC (American Motors Corporation) 304 cubic inch V8 engine is part of the legendary AMC V8 family, which also includes the 360 and 401 cubic inch variants. Introduced in 1971, the 304 quickly became a popular choice for Jeep vehicles due to its compact size, respectable power output, and excellent torque delivery – qualities perfectly suited for the rugged demands of off-road driving and hauling.

Primarily found in the iconic CJ-5, CJ-7, and some Wagoneer and J-series truck models from the early 1970s through the early 1980s, the 304 offered a significant upgrade over the inline-six and four-cylinder engines available at the time. Its cast-iron block and heads, pushrod valvetrain, and two-barrel carburetor configuration (though some later versions featured a four-barrel) made it a straightforward, durable, and relatively easy-to-maintain engine. Its reputation for reliability and its distinctive burble have solidified its place as a classic American powerplant, making "304 Jeep Engine For Sale" a frequent search term for those dedicated to preserving or enhancing these classic machines.

Why Seek a 304 Jeep Engine For Sale? Benefits and Use Cases

The pursuit of a 304 Jeep engine isn’t merely about acquiring a piece of machinery; it’s about embracing a legacy and fulfilling specific automotive needs. Here are the primary reasons why enthusiasts and restorers actively search for this engine:

• Authentic Restoration: For owners of classic CJ-5s and CJ-7s that originally came with a 304, sourcing an original or period-correct engine is paramount for an authentic, show-quality restoration. Maintaining the vehicle’s originality significantly boosts its value and historical accuracy.
• Performance Upgrade: Many older Jeeps were equipped with less powerful inline-four or inline-six engines. Swapping in a 304 provides a substantial boost in horsepower and, more importantly, torque, making the vehicle far more capable for highway driving, towing, and tackling challenging off-road obstacles.



• Reliability and Durability: The AMC 304 is renowned for its robust construction. While not a high-revving performance engine, its design emphasizes longevity and dependability, making it a trustworthy choice for a daily driver or a dedicated trail rig.
• Ease of Maintenance and Parts Availability: Despite its age, the 304 benefits from a vast aftermarket parts network. Routine maintenance items, rebuild kits, and performance upgrades are readily available, making ownership and repair relatively straightforward compared to some other vintage engines.
• Classic V8 Sound and Feel: There’s an undeniable charm to the rumble of a classic American V8. The 304 delivers that quintessential exhaust note and a smooth, torquey power delivery that modern engines often lack, providing a more engaging and nostalgic driving experience.

Understanding the Market: Types of 304 Engines Available

When searching for a 304 Jeep engine, you’ll encounter various conditions and types, each with its own price point and considerations:

1. Used/Salvaged Engines: These are engines pulled directly from donor vehicles, often from junkyards or private sellers.
   • Pros: Most affordable option, potentially ready to run.

   

   • Cons: Condition is unknown; may require significant internal work, gaskets, or even a full rebuild. Risk of hidden damage (cracked block, spun bearings).
   • What to Look For: Compression test results (if available), signs of major leaks, sludge in oil, water in oil, physical damage to block/heads, completeness (carburetor, distributor, accessories).
2. Core Engines: These are used engines sold specifically for rebuilding. They are often incomplete or non-running but are expected to have a usable block and heads.
   • Pros: Very inexpensive, provides a solid foundation for a custom rebuild.
   • Cons: Requires a complete rebuild, significant labor, and additional parts cost.
3. Rebuilt/Remanufactured Engines: These engines have been professionally disassembled, inspected, machined (if necessary), and reassembled with new components (bearings, rings, gaskets, cam, etc.).
   • Pros: "Like-new" condition, often come with a warranty, saves significant labor for the buyer.
   • Cons: Higher initial cost, but can be more cost-effective in the long run than a DIY rebuild of an unknown core.
   • What to Look For: Reputation of the rebuilder, extent of the rebuild (short block vs. long block vs. complete), warranty terms, dyno test results (if available).
4. Crate Engines (Less Common for 304, but possible): While more common for modern engines or popular classic performance engines (like Chevy 350s), some specialized builders might offer new or extensively remanufactured 304s as "crate engines," ready to drop in.
   • Pros: Turnkey solution, highest reliability, often includes performance upgrades.
   • Cons: Most expensive option, very rare for a 304.

Key Considerations Before Purchase

Before committing to a "304 Jeep Engine For Sale," meticulous research and evaluation are crucial.

• Condition Assessment:
  • Visual Inspection: Look for obvious cracks, broken mounts, excessive rust, or signs of major oil/coolant leaks.
  • Oil Quality: Check the oil for milky appearance (coolant in oil) or metallic flakes (internal damage).
  • Compression Test: If possible, perform a compression test. Consistent readings across all cylinders are a good sign; low or widely varying numbers indicate internal wear.
  • Turnover: Manually turn the crankshaft to feel for any binding or rough spots.
  • Running Condition (if applicable): Listen for knocks, excessive smoke (blue for oil, white for coolant, black for rich fuel), or unusual noises.
• Mileage and History: While often difficult to verify for older engines, any known history (e.g., "pulled from a running Jeep," "low mileage rebuild") can be valuable.
• Completeness: Does the engine come with critical components like the carburetor, intake manifold, exhaust manifolds, distributor, alternator, power steering pump, and motor mounts? Missing components can quickly add to your overall cost.
• Compatibility:
  • Transmission Bolt Pattern: The AMC 304 shares the AMC V8 bellhousing bolt pattern, which is distinct from Chevy, Ford, or Mopar patterns. Ensure your transmission (e.g., T-150, T-18, TH400, TF-727) is compatible or plan for an adapter.
  • Engine Mounts: Verify that the engine mounts match your Jeep’s chassis or if adapters will be needed.
  • Accessory Brackets: Original accessory brackets (alternator, power steering, A/C) are often specific to the AMC V8 and can be difficult to source if missing.
• Emissions Requirements: Be aware of your local state or country’s emissions regulations. Older vehicles often have exemptions, but it’s vital to confirm.
• Budget Beyond the Engine: Factor in shipping costs (which can be substantial for an engine), fluids, gaskets, potential minor repairs, and professional installation if you’re not doing it yourself. A "cheap" engine can quickly become expensive.

Where to Find a 304 Jeep Engine For Sale

The market for vintage Jeep parts is vibrant, and several avenues exist for finding a 304:

• Online Marketplaces:
  • eBay: A vast selection of used, rebuilt, and core engines from various sellers. Use specific search terms like "AMC 304 engine," "Jeep 304 V8," or "CJ 304 engine."
  • Craigslist/Facebook Marketplace: Excellent for local finds, potentially saving on shipping. Always meet in a public place and inspect thoroughly.
  • Specialized Forums and Facebook Groups: Dedicated classic Jeep or AMC enthusiast groups often have "for sale" sections where members trade parts. These communities can also offer valuable advice.
• Salvage Yards/Auto Recyclers: Call local or regional salvage yards, especially those specializing in older vehicles or 4x4s. You might find a complete donor vehicle.
• Classic Car/Jeep Parts Dealers: Some businesses specialize in vintage Jeep parts and may have rebuilt or good used 304s in stock. These are often more expensive but offer higher confidence.
• Engine Rebuilders: Contact reputable engine rebuilding shops. They may have cores available, or you can supply one for them to rebuild. Some also specialize in specific engine types.

Tips for a Successful Purchase

• Ask Detailed Questions: Don’t hesitate to ask for specifics about the engine’s history, condition, and any known issues.
• Request Photos and Videos: Get multiple high-resolution photos from different angles. For running engines, ask for a video of it starting and running.
• Verify Seller Reputation: Check reviews, forum feedback, or ask for references if buying from a private party or lesser-known rebuilder.
• Consider a Pre-Purchase Inspection: If the engine is local, arrange for a mechanic (or a knowledgeable friend) to inspect it before you buy.
• Factor in Shipping and Logistics: An engine is heavy! Get precise shipping quotes, understand freight requirements (forklift access, residential vs. commercial delivery), and arrange for appropriate equipment to unload it.
• Get a Written Agreement: For significant purchases, a simple written agreement outlining the engine’s condition, included parts, and return policy (if any) can prevent misunderstandings.

Potential Challenges and Solutions

While acquiring a 304 Jeep engine can be rewarding, there can be hurdles:

• Finding a Good Condition Engine: High-quality used engines are becoming rarer. Solution: Be patient, expand your search radius, and be prepared to pay more for a professionally rebuilt unit.
• Shipping Logistics: Heavy and bulky items like engines require specialized freight. Solution: Use reputable freight companies, clearly communicate delivery requirements, and factor shipping into your budget.
• Hidden Issues: A non-running engine might have internal damage not visible externally. Solution: Assume any used, uninspected engine will need a full rebuild. Budget accordingly. If buying a running engine, perform as many diagnostic tests as possible.
• Compatibility Issues: Swapping a 304 into a Jeep that didn’t originally have one can require new motor mounts, transmission adapters, wiring harness modifications, and exhaust system changes. Solution: Research thoroughly for your specific Jeep model and consider seeking advice from experienced Jeep builders.
• Parts Availability for Specific Components: While major internal parts are available, some ancillary components (e.g., specific brackets, unique emissions parts) can be harder to source. Solution: Join Jeep forums, network with other enthusiasts, and check specialty junkyards.

Price Table: 304 Jeep Engine For Sale (Estimated)

Please note these are estimated price ranges and can vary significantly based on location, seller, included accessories, and the engine’s specific condition.

Engine Type/Condition	Typical Price Range (USD)	Description	Typical Inclusions
Used (Core)	$300 – $800	Non-running, suitable for complete rebuild. May be incomplete or seized.	Bare long block (block, heads, crankshaft, pistons, camshaft), possibly intake manifold.
Used (Running)	$800 – $1,800	Pulled from a running vehicle, generally untested beyond basic running. May need gaskets/minor work.	Long block, intake manifold, carburetor, distributor, exhaust manifolds, some accessories (alternator, power steering pump – condition unknown).
Rebuilt (Short Block)	$2,000 – $3,500	Professionally rebuilt block with new pistons, rings, bearings, camshaft. No heads or external parts.	Block, crankshaft, connecting rods, pistons, rings, bearings, camshaft, timing set.
Rebuilt (Long Block)	$3,500 – $5,500	Professionally rebuilt short block with rebuilt cylinder heads attached. No external accessories.	Short block components + rebuilt cylinder heads with valves, springs, retainers.
Remanufactured (Complete)	$5,000 – $7,500+	Fully rebuilt engine with new/reconditioned components, often includes intake, carb, distributor, etc.	Long block + intake, carburetor, distributor, water pump, oil pump, harmonic balancer, possibly some accessories, often with warranty.

Frequently Asked Questions (FAQ)

Q: Is the AMC 304 a good engine?
A: Yes, the AMC 304 is considered a very good engine for its intended purpose. It’s known for its robust construction, good low-end torque, and reliability, making it ideal for Jeeps and off-road applications. It’s not a high-horsepower drag racing engine, but it’s a dependable workhorse.

Q: What Jeeps came with the 304 engine?
A: The AMC 304 V8 was primarily found in:

• Jeep CJ-5 (1972-1981)
• Jeep CJ-7 (1976-1981)
• Some full-size Jeep Wagoneers and J-series trucks in the early to mid-1970s.

Q: What’s the difference between the AMC 304, 360, and 401 V8s?
A: All three are part of the same AMC V8 engine family, sharing many design elements. The main difference is displacement, achieved through varying bore and stroke dimensions. The 304 is the smallest, followed by the 360, and then the 401. The 360 and 401 typically offer more power and torque, with the 401 being the performance king of the family.

Q: Can I swap a 304 into my 4-cylinder or 6-cylinder Jeep?
A: Yes, it’s a common swap, especially for older CJ models. However, it’s not a direct bolt-in for non-V8 Jeeps. You’ll need different motor mounts, a compatible transmission or adapter, a new radiator, exhaust system, and potentially wiring modifications. It’s a significant project but a rewarding one for the power increase.

Q: Are parts still available for the 304?
A: Absolutely! Due to its popularity and shared components with the 360 and 401, parts availability for the AMC 304 is excellent. Most standard rebuild components (pistons, rings, bearings, gaskets, camshafts, valvetrain parts) are readily available from various aftermarket suppliers.

Q: What should I look for when buying a used 304?
A: Prioritize a compression test if possible. Visually inspect for cracks, excessive rust, and signs of major leaks. Check the oil for contaminants. Inquire about its history and completeness. Assume any used engine will require at least a thorough inspection and new gaskets, if not a full rebuild.

Conclusion

The "304 Jeep Engine For Sale" represents more than just a search query; it’s an entry point into a vibrant community of classic Jeep enthusiasts dedicated to preserving and enhancing these American legends. The AMC 304 V8, with its robust design, ample torque, and distinctive character, remains a highly sought-after powerplant for authentic restorations, performance upgrades, and those simply yearning for the classic V8 experience.

By understanding its history, evaluating the various types available, considering key practicalities, and leveraging the diverse market, you can successfully acquire the heart for your next Jeep project. While challenges may arise, the enduring satisfaction of hearing that iconic 304 rumble to life in your classic Jeep makes every effort worthwhile. Embrace the journey, and enjoy the power of a true American icon.