ATK 4.7L Inline 6 Stroker Jeep Engine - HP25

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  • ATK NORTH AMERICA | Part Number: ATKHP25
  • Engine Configuration:L6
  • Displacement:242
  • Engine Type:Long Block
  • Fitment:Universal Fit


Produces 205 HP and 280 pound-foot torque. Engine Type: AMC Straight 6 cylinder Displacement ( 242 Bore/Stroke: .040-.060 x 3.906 Crankshaft: Scat Nodular Steel Rods: OE 6.125" Pistons: Hypereutectic Dished Compression: 9.3:1 Rings: Moly Camshaft: Flat Tappet Camshaft Lift: lift .462 x .478 Camshaft Duration @.50:206x212 Cam Specs: 206/212 @50 .462in/.478ex 113LSA Cylinder Heads: OE Cast Iron #686 Rocker Arms: OE Stamped Steel Recommended Fuel: 92 Octane + Max RPM: 5300 Warranty: 2 years unlimited miles For your engine core return, the engine core needs only to be the same type as the ATK engine supplied, complete and with no visible damage and be able to turn over 360 degrees. Core pickup is easy. Place it in the crate and call the pickup number provided with the bill of lading. We pay the freight back. We will contact you after the sale for your vehicle VIN number, cylinder block and head casting numbers. **Retail price does not include the manufacturer core charge. A sales rep will contact you when your order is received.

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Question & Answers

4 Answered questions

Q: I don't know the casting #s on my '99 XJ's 4.0, but this should be a direct replacement, correct? Are there any flexplate, converter, or crank mods to to mate to my stock automatic? Answer this question

A: This does not fit the '99 XJ.

Answered by Kelly from 4WP Corporate Headquarters on 06/21/2021

Q: will this bolt up to my 1988 jeep wrangler has 4.2 in it now Answer this question

A: No - it fits 1987-1990 All Models with the 4.0L engine.

Answered by Kelly from 4WP Corporate Headquarters on 04/20/2021

Q: will this fit in a 1985 CJ7 to replace the 4.2L?? Answer this question

A: Thanks for the inquiry Rick, the ATK NORTH AMERICA 4.7L Stroker Jeep Engine part # ATKHP25 we're not showing this will work nor do they offer this product for your year vehicle.

Answered by RK on 06/16/2015

Q: the engines have really low hp are they made to run on 87 octane gas ? Answer this question

A: Hello there, the ATK NORTH AMERICA 4.7L Stroker Jeep Engine's can be ran with 87 octane gas. Any company will tel you to run a better gas to get the best over all performance. Shop with us anytime, on your schedule. Browse, call our customer service center, or come visit us in one of our stores. You can even save on shipping costs by shopping online and picking your order up in a store. No matter which method you prefer, we’re ready to help with excellent parts, advice, and service.

Answered by Ray Ray on 11/11/2014


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