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Remanufactured Long Block AMC 401 1974-1978

Part Number:
Calculated at Checkout

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Product Details

Remanufactured, NOT rebuilt. And yes there is a difference, a big difference. Unlike many of the products out there, S&J 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, S&J uses the latest in engine technology, tools, and expertise to transform your engine. S&J continually upgrades its equipment and training to ensure the engines we produce today are equal to or better than the original. When you purchase your engine from S&J Engines you receive the highest quality remanufactured engine available from the most committed engine supplier in existence. When it is possible to do it better, they will.  

In order to activate your engine warranty, S&J Engines, Inc. must receive a completed Warranty Form within sixty (60) days of receipt of purchase.  Failure to complete the verification process renders your warranty null and void.  To view warranty requirements and conditions, click HERE.

**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.

**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 1974-1978 Wagoneer
  • Fits 1974-1978 J-truck
  • Fits 1974-1978 Cherokee
  • 7-Year/100,000 mile warranty - Not Pro-Rated
  • Guaranteed to meet or exceed the OEM quality and specifications
  • Installed precision milled cylinder heads
  • 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
  • New Hydraulic Flat Tappet Lifters
  • Ships via Ground from Spokane, WA

Reviews (2)

  • question

    Posted by Bruce on Oct 7th 2017

    Hello I plan to ride a 401 on a J10 Honcho stepside from 1982 to today a 360 auto box can you advise me the best THANK YOU

  • Very Happy

    Posted by matt galey on Sep 7th 2016

    I had them rebuild my 401. I was very happy with the results. His engine builder was very professional and I have had no issues with the motor yet. Only complaint I have is I would have liked to know what size pistons they put in it. Other than that I am very happy. The turn around time was less than 3 weeks from the time my motor left my shop and came back.