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ATK AMC 258 CID Inline 6 Cylinder Replacement Jeep Engine - DA21

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  • ATK NORTH AMERICA | Part Number: ATKDA21
  • Engine Configuration:L6
  • Engine Type:Long Block
  • Fitment:Universal Fit
  • Displacement:258


When you purchase an engine from ATK you can rest assured that you are buying something that is better than new quality. Why does ATK have better than new quality? Every engine that ATK remanufactures is reverse engineered to ensure that any original factory defects are removed, saving you time and money and keeping your car or light truck on the road and out of the shop. *Retail price does not include the manufacturer core charge. A sales rep will contact you when your order is received regarding the core charge and availability.



Question & Answers

3 Answered questions

What is average time needed for delivery of this product?

Asked by Billy Bad Mechanic from Michigan on

Hi Billy, Unfortunately the 258 engine is not available to us at this time. Thank you for your inquiry.

Answered by Jim G Ext 4806 from Michigan on

is the check valve in the block something that is not present in my stock jeep engine? Should this just "plug and play" if replacing a stock 258?

Asked by Billy Bad Mechanic from Michigan on

Hello, As long as the casting numbers match the motor you have now than this would be a direct replacement. Please let us know if you have any other questions. Thanks!

Answered by Tom S. Ext. 4876 from Michigan on

horse power

Asked by Jim from Tekamah Ne on

Hello Jim, These are setup for the factory specs. If you have anymore questions please ask, Thank you.

Answered by JordanC extension4833 from Tekamah Ne on


As the largest private label crate engine remanufacturer in North America, ATK has been around for over 80 years producing parts including high performance engines, transmissions and rear axles. When your Jeep needs an engine rebuild, an ATK remanufactured engine uses reverse engineering processes to virtually eliminate factory defects that hinder performance. One reason ATK is at the forefront of engines is their adherence to thorough cleaning and inspection techniques and their machining and magnafluxing capabilities. If staying out of the garage and out on the trail is a priority, rely on ATK to get your 4x4 up and running. Shop ATK NORTH AMERICA Now