1980 Jeep CJ7 258 Motor For Sale: The Enduring Heart of a Legend

1980 Jeep CJ7 258 Motor For Sale: The Enduring Heart of a Legend jeeps.truckstrend.com

The 1980 Jeep CJ7 stands as a testament to rugged American engineering and the spirit of adventure. At the core of many of these iconic off-roaders was the venerable AMC 258 cubic inch (4.2L) inline-six engine. For enthusiasts, restorers, and mechanics alike, finding a 1980 Jeep CJ7 258 motor for sale is more than just acquiring a piece of machinery; it’s an opportunity to revitalize a classic, complete a restoration, or ensure the longevity of a beloved vintage vehicle. This comprehensive guide delves into everything you need to know about this legendary engine, from its history and benefits to the practicalities of purchasing one in today’s market.

The Heart of the Beast: Understanding the AMC 258 I6 Engine

1980 Jeep CJ7 258 Motor For Sale: The Enduring Heart of a Legend

The AMC (American Motors Corporation) 258 cubic inch straight-six engine is a cornerstone of Jeep history, renowned for its simplicity, prodigious low-end torque, and remarkable durability. Introduced in 1971 as a larger displacement version of the earlier AMC 232, it quickly became the standard engine for many Jeep models, including the CJ series, Wagoneer, and Cherokee.

For the 1980 Jeep CJ7, the 258 was typically paired with a carburetor (often a Carter BBD or Motorcraft 2100/2150) and a relatively basic emissions control system compared to later years. While its factory horsepower rating (around 110-120 hp) might seem modest by modern standards, its true strength lies in its torque output, often exceeding 200 lb-ft at low RPMs. This characteristic makes it perfectly suited for off-road crawling, towing, and everyday utility where grunt is more valuable than outright speed.

The engine’s cast-iron block and cylinder head, seven main bearings, and robust design contribute to its legendary status. It’s an engine that was built to last, capable of accumulating hundreds of thousands of miles with proper maintenance. Its mechanical simplicity also means it’s relatively easy for the home mechanic to diagnose and repair, a significant advantage for owners of vintage vehicles.

Why Buy a 1980 Jeep CJ7 258 Motor?

The reasons for seeking out a 1980 Jeep CJ7 258 motor are as varied as the enthusiasts themselves:

1. Authentic Restoration: For purists, maintaining the originality of a 1980 CJ7 means using the correct engine. A period-correct 258 is essential for a true-to-form restoration project, preserving the vehicle’s historical value and character.
2. Engine Replacement/Swap: If your existing 258 is beyond repair, or if you’re upgrading from a smaller engine like the four-cylinder, a replacement 258 offers a straightforward swap. Its direct bolt-in nature (for most CJ7s) minimizes fabrication and complexity.



3. Unmatched Reliability & Durability: The 258’s reputation for being a bulletproof workhorse is well-earned. When properly maintained, these engines are incredibly resilient, making them ideal for a vehicle that’s expected to perform in challenging conditions.
4. Ease of Maintenance & Parts Availability: Due to its widespread use and long production run, parts for the AMC 258 are still readily available, both new aftermarket and used OEM. This makes maintenance and future repairs much more manageable and affordable than for many other vintage engines.
5. Simplicity for DIY Mechanics: Without complex electronic fuel injection or sophisticated engine management systems, the carbureted 258 is a dream for those who prefer to work on their own vehicles. Diagnosis often involves basic tools and a fundamental understanding of internal combustion.
6. Torque for Off-Roading: The high torque output at low RPMs is invaluable for off-road enthusiasts. It allows the CJ7 to crawl over obstacles with ease, requiring less throttle and reducing stress on the drivetrain.

Key Considerations When Buying a Used 258 Motor

Purchasing a used engine, especially one that’s over 40 years old, requires careful consideration. Here’s what to look for:

• Condition Assessment:
  
  • Visual Inspection: Look for excessive oil leaks, signs of major damage (cracks in the block or head), or obvious rust. A clean engine isn’t always a good engine, but excessive grime can hide problems.
  • Compression Test (if possible): This is crucial. Even compression across all cylinders (within 10-15% variance) indicates good rings and valves. Low or uneven compression points to significant wear or damage.
  • Oil Condition: If the engine is still in a vehicle, check the oil. Milky oil indicates coolant contamination; metallic flakes suggest internal wear.
  • Listen for Knocks/Taps: If the engine can be run, listen for unusual noises like rod knocks, piston slap, or lifter tick.
  • Smoke from Exhaust: Blue smoke indicates oil burning; white smoke suggests coolant burning.
• Mileage & Usage History: While often hard to verify, ask about the engine’s history. Was it a daily driver, an off-road beast, or pulled from a wreck? Any documentation of maintenance or rebuilds is a huge plus.
• Completeness: Is it a long block (block, head, rotating assembly), a short block (block, crank, rods, pistons), or a complete engine with accessories (carburetor, manifold, distributor, alternator, power steering pump)? A complete engine might seem more expensive initially but saves you the hassle and cost of sourcing missing parts.
• Carburetor & Emissions Equipment: The 1980 258 often came with a somewhat finicky Carter BBD carburetor and various vacuum lines for emissions. Many owners modify or remove these over time. Be aware of your local emissions laws if you plan to keep the vehicle street legal. You might consider a rebuild kit for the carb or an aftermarket upgrade.
• Source Reliability: Buying from a reputable engine rebuilder, a specialized Jeep salvage yard, or a known enthusiast generally reduces risk compared to a random online listing.

The Buying Process: A Step-by-Step Guide

1. Research & Budgeting: Determine what type of 258 you need (core for rebuild, running pull-out, fully rebuilt) and set a realistic budget. Factor in potential shipping costs, ancillary parts, and labor if you’re not doing the work yourself.
2. Finding Sources:
   • Online Marketplaces: Craigslist, Facebook Marketplace, eBay are common, but require diligence.
   • Jeep Forums & Clubs: Dedicated communities often have "for sale" sections where enthusiasts sell parts. These can be great sources for well-maintained engines.
   • Specialized Salvage Yards: Yards specializing in Jeeps or classic cars are excellent places to find donor vehicles.
   • Engine Rebuilders: Reputable shops often sell rebuilt 258s, offering warranties and peace of mind, albeit at a higher price.
3. Asking the Right Questions:
   • "Was the engine running when pulled?"
   • "Why was it pulled?"
   • "What’s included with the engine (carb, distributor, accessories)?"
   • "Are there any known issues (leaks, noises)?"
   • "Has it ever been rebuilt? If so, when and by whom?"
4. Inspection (In-Person is Best):
   • If possible, inspect the engine in person. Bring a flashlight and a magnet.
   • If it’s still in a vehicle, ask to hear it run.
   • If buying remotely, request detailed photos and videos, and ask for a trusted third-party inspection if feasible.
5. Negotiation: Be prepared to negotiate based on the engine’s condition, completeness, and market value. Don’t be afraid to walk away if something feels off.
6. Transportation: Engines are heavy. Plan for appropriate lifting equipment (engine hoist) and transportation (pickup truck or trailer). Discuss shipping options and costs if buying long-distance.
7. Post-Purchase Considerations:
   • Rebuild vs. Drop-in: Even a "running" used engine should ideally have new gaskets and seals before installation. A full rebuild might be necessary depending on its condition.
   • Break-in: If you rebuild the engine, follow proper break-in procedures to ensure longevity.

Potential Challenges and Solutions

• Finding a Good Core: Many used 258s available as "cores" are severely worn. Solution: Be patient, inspect thoroughly, and budget for a complete rebuild.
• Emissions Compliance: A carbureted 1980 engine might struggle with modern emissions tests in some regions. Solution: Research local laws. Consider upgrading to aftermarket fuel injection (like a Holley Sniper or FiTech system) for better performance and potentially cleaner emissions.
• Missing Ancillary Parts: Engines are often sold bare, requiring you to source a carburetor, ignition system, and accessories. Solution: Factor the cost and time of acquiring these into your budget. Many parts are available new or rebuilt.
• Shipping Costs: Engines are heavy and bulky, leading to high shipping fees. Solution: Prioritize local sellers or arrange for freight shipping with a reputable carrier.

Estimated Price Guide for 1980 Jeep CJ7 258 Motors For Sale

Prices for a 1980 Jeep CJ7 258 motor can vary wildly based on condition, completeness, and location. This table provides estimated ranges for different categories:

Condition Category	Description	Estimated Price Range (USD)	Key Considerations
Core Engine	Non-running, suitable for rebuild. May be seized, partially disassembled, or have unknown internal damage.	$200 – $600	Pros: Cheapest option, blank slate for custom build. Cons: Requires full rebuild (pistons, bearings, cam, machining, etc.), significant time and cost investment beyond purchase price. Condition is critical; avoid blocks with visible cracks.
Running Pull-Out	Engine was running when removed from a vehicle. Condition varies greatly from "good" to "barely running."	$700 – $1,500	Pros: Potentially usable with minimal work. Cons: High risk; may have hidden issues (low compression, oil burning, knocks). Assume it needs at least new gaskets/seals. Always try to hear it run or get a compression test. Often sold without accessories.
Used, Tested	A running pull-out that has been tested by the seller (e.g., compression test, oil pressure check).	$1,000 – $2,000	Pros: More confidence in its basic health than an untested pull-out. Cons: Still a used engine; wear is present. "Tested" doesn’t mean "rebuilt." May or may not include accessories.
Professionally Rebuilt	Disassembled, inspected, machined, and reassembled with new components (pistons, rings, bearings, etc.) by a reputable shop.	$2,500 – $4,500+	Pros: "Like new" condition, often comes with a warranty, ready for installation. Cons: Most expensive option. Varies by shop quality and what’s included (e.g., carb, distributor, accessories). Essential for those seeking reliability without the DIY rebuild hassle.
Complete with Accessories	Any of the above, but includes key components like carburetor, distributor, manifolds, and possibly alternator/power steering pump.	Add $300 – $800+	Pros: Saves time and effort sourcing individual components. Cons: Price increases. Ensure included accessories are functional or rebuildable.

Note: These are estimates and can fluctuate based on location, seller, market demand, and the overall completeness/provenance of the engine.

Frequently Asked Questions (FAQ)

Q1: Can I put a 258 motor from a different year into my 1980 CJ7?
A1: Generally, yes. The AMC 258 engine block and basic architecture remained largely consistent from the early 70s through the late 80s. However, specific accessories, manifolds, carburetors, and emissions equipment varied significantly by year and application. You may need to swap your 1980 specific components onto the donor engine for proper fit and function, especially regarding the intake/exhaust manifold and accessory brackets.

Q2: What’s the difference between the 258 and the later 4.0L Jeep engine?
A2: The 4.0L (242 cubic inch) inline-six is the direct evolution of the 258. Key differences include the 4.0L being fuel-injected (MPI), having a higher compression ratio, and revised cylinder head and intake manifold designs, resulting in significantly more horsepower and torque, better fuel economy, and lower emissions. While a 4.0L can be swapped into a CJ7, it’s a more involved process requiring wiring harness changes, fuel system upgrades, and often a different transmission bell housing.

Q3: Should I buy a "running pull-out" or invest in a professionally rebuilt engine?
A3: This depends on your budget, mechanical skill, and desired reliability. A running pull-out is cheaper upfront but carries risk; it’s best for someone who can perform a basic assessment and is prepared for potential issues or a future rebuild. A professionally rebuilt engine is more expensive but offers peace of mind, a warranty, and is essentially a "new" engine, ideal for a long-term reliable build or if you lack the time/skill for a rebuild yourself.

Q4: Are parts for the 258 hard to find?
A4: Most common wear parts for the 258 (pistons, rings, bearings, gaskets, camshafts, lifters) are still readily available from aftermarket suppliers. Basic engine components are generally easy to find. Specific 1980-era emissions components or rare OEM parts might be trickier, but the core engine parts are well-supported.

Q5: How much horsepower does a stock 1980 258 have?
A5: A stock 1980 AMC 258 typically produced around 110-120 horsepower and approximately 200-210 lb-ft of torque. Its strength is in its low-end torque, not high horsepower. Performance can be improved with aftermarket carburetors, exhaust systems, and ignition upgrades.

Conclusion

The 1980 Jeep CJ7 258 motor remains a highly sought-after component for a reason. Its legacy of reliability, simplicity, and rugged torque makes it the ideal heart for an authentic CJ7 restoration or a robust replacement for a tired engine. While acquiring a used engine presents its challenges, a thorough understanding of what to look for, where to buy, and what questions to ask will significantly improve your chances of success.

Investing in a 258 motor is more than just a transaction; it’s a commitment to keeping a piece of automotive history alive. With careful consideration and a bit of mechanical know-how, you can ensure your 1980 Jeep CJ7 continues to conquer trails and turn heads for many years to come, powered by the dependable inline-six that helped define the Jeep legend.