Jeep 304 Engine For Sale: Your Comprehensive Guide to Finding and Understanding This Classic V8

Jeep 304 Engine For Sale: Your Comprehensive Guide to Finding and Understanding This Classic V8 /jeeps.truckstrend.com

The rumble of a classic American V8 engine is a sound that resonates deeply with automotive enthusiasts, and for Jeep aficionados, the AMC 304 V8 holds a special place. Originally powering a range of iconic Jeep models from the early 1970s through the mid-1980s, the 304 cubic inch (5.0L) engine is renowned for its robust construction, respectable torque output, and relatively straightforward design. Today, the demand for a Jeep 304 Engine For Sale remains strong, driven by restoration projects, performance upgrades for smaller-engined Jeeps, or simply the desire to keep a piece of automotive history alive.

This comprehensive guide will delve into everything you need to know about finding, evaluating, and purchasing a Jeep 304 Engine For Sale. Whether you’re a seasoned mechanic or a first-time classic Jeep owner, understanding the nuances of this enduring powerplant is crucial for a successful acquisition.

Jeep 304 Engine For Sale: Your Comprehensive Guide to Finding and Understanding This Classic V8

Understanding the Legendary AMC 304 V8

Before you embark on your search for a Jeep 304 Engine For Sale, it’s helpful to understand what makes this engine a classic. The AMC (American Motors Corporation) 304 V8 was part of a family of V8 engines produced by AMC, which also included the 360 and 401 cubic inch versions.

Key Specifications and History:

• Displacement: 304 cubic inches (5.0 liters)
• Cylinders: V8
• Horsepower: Varied by year and application, typically ranging from 125 to 150 hp (net)
• Torque: Often around 220-245 lb-ft (net), providing excellent low-end grunt for off-road use.



• Production Years: Primarily 1971-1981 in various Jeep models.
• Notable Vehicles: CJ-5, CJ-7, J-series pickups (J10, J20), Wagoneer, Cherokee (SJ).

The 304 was praised for its simplicity and durability. Its cast-iron block and cylinder heads were built to withstand demanding conditions, making it a reliable workhorse for both on-road driving and off-road adventures. Its compact size for a V8 also made it a popular choice for swaps into Jeeps originally equipped with smaller inline-six engines.

Why Seek a Jeep 304 Engine For Sale Today?

The market for a Jeep 304 Engine For Sale is vibrant for several reasons:

1. Authentic Restorations: For purists, maintaining the originality of a classic Jeep means keeping the correct engine. A good 304 is essential for a period-correct restoration.
2. Performance Upgrades: Many CJ-5s and CJ-7s were originally sold with the AMC 258 cubic inch (4.2L) inline-six engine. While capable, the 304 V8 offers a significant bump in horsepower and, more importantly, torque, providing a more exhilarating driving experience and better capability for towing or conquering tough trails. The swap is relatively straightforward due to shared mounting points and transmission bolt patterns with the 258.
3. Reliability and Maintainability: Despite its age, the 304 is a relatively simple engine to maintain and repair. Parts availability, thanks to a dedicated aftermarket and shared components with other AMC V8s, is generally good.



4. Cost-Effectiveness: Compared to sourcing and installing modern crate engines or highly customized powertrains, a rebuilt or well-maintained 304 can be a more budget-friendly option for adding V8 power to a classic Jeep.

Types of Jeep 304 Engines Available For Sale

When looking for a Jeep 304 Engine For Sale, you’ll encounter various conditions and configurations, each with its own price point and considerations.

• Used/Pull-Out Engines: These are engines removed directly from donor vehicles. Their condition can vary wildly, from running well to seized. They are typically the cheapest option but come with the most risk regarding unknown wear, maintenance history, and potential internal damage.
• Running Pull-Out Engines: A step up from a standard used engine, these are sold with a guarantee that they were running when pulled. While better, they still carry risks as internal wear isn’t visible. Compression tests are vital for these.
• Core Engines: These are non-running engines, often seized or disassembled, sold primarily for their rebuildable components (block, crankshaft, cylinder heads). They are the cheapest way to acquire a 304 but require a complete overhaul, making them suitable only if you plan a full rebuild.
• Partially Rebuilt/Long Block/Short Block:
  • Short Block: Consists of the block, crankshaft, connecting rods, and pistons. It requires cylinder heads, valvetrain, and all external accessories.
  • Long Block: Includes the short block plus cylinder heads, valvetrain, and timing components. It’s a more complete assembly but still needs external accessories like the intake manifold, carburetor, distributor, etc.
  • These options offer a middle ground, reducing some of the rebuild work but still requiring significant effort to make them a complete, running engine.
• Professionally Rebuilt/Remanufactured Engines: These are engines that have been completely disassembled, inspected, machined to factory specifications, and reassembled with new components (pistons, rings, bearings, camshaft, valvetrain, oil pump, etc.). They are the most expensive option but offer the highest reliability and often come with a warranty, providing peace of mind.

Where to Find a Jeep 304 Engine For Sale

The hunt for a Jeep 304 Engine For Sale can take you to several different places:

1. Online Marketplaces:
   • eBay: A vast selection, but be wary of shipping costs and seller reputation. Look for detailed descriptions and photos.
   • Craigslist/Facebook Marketplace: Excellent for local finds, potentially allowing for in-person inspection and avoiding shipping costs. Use specific search terms like "Jeep 304 V8," "AMC 304," or "CJ V8 engine."
   • Specialized Forums & Classifieds: Websites and forums dedicated to classic Jeeps (e.g., CJ-8 Scrambler forums, AMC Jeep enthusiast sites) often have classified sections where owners sell parts directly. These communities can be a great source of reputable sellers and valuable advice.
2. Salvage Yards/Junkyards: Local yards, especially those specializing in older vehicles or 4x4s, might have a Jeep 304 Engine For Sale. This allows for physical inspection, but conditions are often "as-is."
3. Engine Rebuilders & Specialty Shops: Many shops that specialize in classic car or truck engines will either have rebuilt 304s in stock or can source and rebuild one for you. This is often the most reliable but also the most expensive route.
4. Word-of-Mouth: Networking with local Jeep clubs, attending classic car shows, or visiting local mechanic shops can sometimes lead to hidden gems.

Key Considerations Before Buying a Jeep 304 Engine For Sale

Purchasing a Jeep 304 Engine For Sale requires careful evaluation to avoid costly mistakes.

• Condition Assessment:
  • Visual Inspection: Look for significant rust, cracks in the block or heads, signs of previous repairs, and oil leaks.
  • Fluid Check: If possible, check the oil for signs of water (milky) or excessive metal flakes.
  • Turning the Engine: Try to turn the crankshaft by hand (with a wrench on the crank bolt). It should turn smoothly without binding. If it’s seized, it’s a core.
  • Compression Test (for running engines): This is crucial. Low or uneven compression indicates internal wear or valve issues.
  • Oil Pressure (if running): If the engine can be started, observe oil pressure. Low pressure is a red flag.
• Completeness: Does the engine come as a "long block" or "short block"? Are essential accessories included (carburetor, distributor, exhaust manifolds, water pump, power steering pump, alternator)? Missing components can add significant cost.
• Documentation: Always ask for a bill of sale. If possible, get information about the donor vehicle (VIN) and the engine’s history.
• Shipping & Logistics: A V8 engine is heavy. Factor in freight shipping costs, which can be substantial. Local pickup can save a lot of money. Ensure the seller can properly crate and load the engine.
• Compatibility: While the 304 is a common swap, ensure it’s compatible with your specific Jeep model and existing transmission. You might need specific motor mounts, a different flywheel/flexplate, or transmission adapter plates.
• Seller Reputation: Check reviews, ask for references, and communicate thoroughly with the seller. A reputable seller will be transparent about the engine’s condition.

Practical Advice for Your Purchase

• Set a Realistic Budget: Beyond the engine’s purchase price, account for potential shipping, accessories, a potential rebuild (even if it’s a "running" engine, a freshening up is wise), and installation costs.
• Ask for Photos and Videos: High-resolution photos from multiple angles are essential. For running engines, ask for a video of it starting and running, showing oil pressure and listening for strange noises.
• Be Patient: Finding the right Jeep 304 Engine For Sale can take time. Don’t rush into a purchase.
• Consider a Pre-Purchase Inspection: If buying locally, consider having a mechanic inspect the engine, especially if it’s a significant investment.
• Negotiate: Always try to negotiate the price, especially on used engines.
• Understand Warranties/Return Policies: For rebuilt engines, ensure you understand the warranty terms. For used engines, assume "as-is" unless explicitly stated otherwise in writing.

Challenges and Solutions

• Finding a Good Core: Many available 304s are high-mileage or neglected. Patience and thorough inspection are key. Consider a professional rebuild if you find a solid core but it needs work.
• Shipping Costs: Look for sellers within a reasonable driving distance. Group buys with other enthusiasts can sometimes reduce freight costs.
• Unexpected Issues: Even a running engine can hide problems. Budget for potential repairs or a full rebuild down the line. A professional rebuild mitigates this risk significantly.
• Parts Availability: While generally good, some specific OEM parts might be hard to find. The aftermarket offers many solutions, and shared parts with 360/401 engines help.

Jeep 304 Engine For Sale: Estimated Price Guide

Prices for a Jeep 304 Engine For Sale can fluctuate based on condition, completeness, seller, and market demand. This table provides a general estimate:

Engine Type/Condition	Estimated Price Range (USD)	Key Features/Notes
Core Engine (Non-Running)	$200 – $600	Block, crank, heads, may be seized or disassembled. Requires full rebuild.
Used/Pull-Out (As-Is)	$500 – $1,500	Removed from vehicle, condition unknown. May or may not run. High risk.
Running Pull-Out	$1,000 – $2,500	Verified running when pulled. Still high mileage, unknown internal wear. Compression test highly recommended.
Partially Rebuilt (Long Block)	$2,000 – $3,500	New internal components (rings, bearings), but may need valvetrain work, external accessories. No warranty typical.
Professionally Remanufactured/Rebuilt	$3,500 – $6,000+	Fully machined, new components, tested, often comes with a warranty. Highest reliability.

Note: These are estimates only and do not include shipping costs, which can range from a few hundred to over a thousand dollars depending on distance and service.

Frequently Asked Questions (FAQ) about the Jeep 304 Engine

Q: What Jeep models came with the 304 engine?
A: The AMC 304 V8 was primarily found in CJ-5s and CJ-7s from 1972 to 1981, as well as some J-series trucks (J10, J20) and Wagoneers/Cherokees (SJ models) during the same era.

Q: Is the 304 a good engine for off-roading?
A: Yes, the 304 is well-suited for off-roading due to its excellent low-end torque, robust construction, and relatively simple design, making it reliable and easy to work on in the field.

Q: Can I swap a 304 into a CJ that originally had a 6-cylinder engine?
A: Yes, it’s a common and popular swap. The AMC 304 shares the same bell housing bolt pattern as the AMC 258 I6, simplifying transmission mating. However, you will need V8 motor mounts, a V8 radiator, and potentially a different exhaust system and throttle linkage.

Q: What are common issues with the AMC 304?
A: Like many engines of its era, common issues can include oil leaks (especially from the rear main seal and valve covers), carburetor issues (often resolved with a rebuild or replacement), and ignition system quirks. These are generally manageable with proper maintenance.

Q: How does the 304 compare to the AMC 360 or 401?
A: The 304 is the smallest of the AMC V8 family. The 360 (5.9L) and 401 (6.6L) offer more displacement, and consequently, higher horsepower and torque. Externally, they are very similar, sharing many parts, which is beneficial for parts availability. The 304 is often chosen for its balance of power, relatively lighter weight, and ease of fitment.

Q: Are parts readily available for the 304?
A: Yes, due to its popularity and shared components with the larger AMC V8s, most common replacement parts (gaskets, bearings, pistons, rings, camshafts, valvetrain components, ignition parts) are readily available from aftermarket suppliers.

Conclusion

The search for a Jeep 304 Engine For Sale is more than just a transaction; it’s an investment in the legacy of classic American motoring. The AMC 304 V8 offers a fantastic blend of historical authenticity, robust performance, and relative simplicity, making it a highly desirable powerplant for anyone looking to restore a vintage Jeep or upgrade its capabilities.

By thoroughly understanding the different types of engines available, knowing where to look, and performing diligent inspections, you can significantly increase your chances of finding a quality 304 that will bring years of enjoyment. Whether you opt for a budget-friendly core to rebuild yourself or a professionally remanufactured unit, the enduring rumble of this classic V8 will ensure your Jeep stands out on the trails and on the road, keeping a cherished piece of automotive history alive and roaring.