Remanufactured Long Block AMC 258 4.2L Straight 6 1972-1988

Remanufactured, NOT rebuilt. And yes there is a difference, a big difference. Unlike many of the products out there, our engines are not simply taken apart and rebuilt. They are painstakingly inspected, piece by piece, element by element and each component is given new life. And rather than expect yesterday's equipment to keep up with today's tougher engine tolerances, we use the latest in engine technology, tools, and expertise to transform your engine. The equipment used and training are constantly upgraded to ensure the engines produced today are equal to or better than the original. When you purchase your engine from us, you receive the highest quality remanufactured engine available from the most committed engine supplier in existence.  

Warranty Options

• Standard Warranty: 7-Year/100,000 mile warranty - Not Pro-Rated.
  • For privately installed engines, the standard warranty labor rate pays up to $25 per hour with a maximum of $600 parts, labor and / or engine exchange (labor is covered for 1 year or 100,000 miles, whichever occurs first). 
  • For professionally installed engines, the standard warranty labor rate pays up to $50 per hour to a maximum of $850 parts, labor and / or engine exchange (labor is covered for 3 years or 100,000 miles, whichever occurs first).
  • The Standard Warranty is NON-transferable.
• Premium Warranty: 7-Year/100,000 mile warranty - Not Pro-Rated.
  • For privately installed engines, the standard labor rate pays up to $50 per hour with a max of $1,200 parts, labor and / or engine exchange (labor is covered for 2 years or 100,000 miles, whichever occurs first).
  • For professionally installed engines, the standard labor rate pays up to $85 per hour to a maximum of $1,750 parts, labor and / or engine exchange (labor is covered for 7 years or 100,000 miles, whichever occurs first).
  • The Premium warranty IS transferable (fee required)
• To be considered “professionally installed” the engine must be installed by a licensed business open to the public. All other installations will be considered “privately installed”.
• The Premium Warranty must be purchased with the engine and is not available as an upgrade separately after ordering.
• **Note that the maximum amounts listed above are for the life of the warranty and are NOT on a per-claim basis.

In order to activate your engine warranty, the Warranty Form must be completed within sixty (60) days of receipt of the engine (we will send a link shortly after your engine ships).  Failure to complete the verification process renders your warranty null and void, NO exceptions!   

**Note: sometimes we have engines that are already built / ready to ship that are painted grey.  If the color you select is different, we will include a can of paint in the color you select.

Image is for illustrative purposes only, and may vary from actual engine.

**RV Cam Note: if you select the 4.0L Cylinder Head Upgrade, the RV Style Camshaft for that head is more expensive as it includes a different RV Style Camshaft than the 4.2L head uses, and also utilizes upgraded upgraded springs.

**CORE REFUND NOTE: All cores must be received back within 180 days of the original order date (NOT from when you receive the engine) in order to receive a core refund to your original payment method.  After 180 days, core refunds are only available as store credit (no exceptions).  Also, all cores must be in good, rebuildable condition.  Any cores that have damaged / non-usable parts may incur charges (which will be deducted from the core return value). Engines that are 0.060 or over are not rebuildable, and will not receive a core refund.

 

 

• Fits 1972-1983 Wagoneer
• Fits 1972-1988 J-truck
• Fits 1974-1983 Cherokee
• Fits 1984-1988 Grand Wagoneer
• 7-Year/100,000 mile warranty - Not Pro-Rated
• Guaranteed to meet or exceed the OEM quality and specifications
• Installed precision milled cylinder head
• Installed Valve train: new valves (stainless exhaust & plated intake valves), new valve seals, new valve seating
• Leak tested Heads & Block
• New Main Bearings
• New Oil Pump
• New Pistons
• New Rod Bearings
• New Seals & Gaskets
• New Timing Chain
• Break-In Oil Included
• Ships via Ground Freight