ATK 4.7L Baja Stroker Jeep Engine - HP86

universal fit logo


  • ATK NORTH AMERICA | Part Number: ATKHP86
  • Engine Configuration:L6
  • Displacement:242
  • Engine Type:Long Block
  • Fitment:Universal Fit


Produces 270 HP and 320 pound-foot torque. This is the engine combination that won the Baja 1000 for Team ATK. Other modifications may be needed (Injectors, Throttle Body, ECU, Exhaust ect.) Engine Type: AMC Straight 6 cylinder Displacement ( 242 Bore/Stroke: .040-.060 x 3.906 Crankshaft: Scat Nodular Steel Rods: OE 6.125" Pistons: Forged Dished Compression: 9.3:1 Rings: Moly Camshaft: Flat Tappet Camshaft Lift: lift .484 x .507 Camshaft Duration @.50:213x220 Cam Specs: 213/220 @50 .487in/.507ex 112LSA Cylinder Heads: Ported OE Cast Iron #686 Rocker Arms: Harland Sharp Billet Aluminum Roller Recommended Fuel: 92 Octane + Max RPM: 5300 Warranty: 1 year/12,000 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.

Customer Reviews

0.0 0.0
0 Customer ratings


Question & Answers

3 Answered questions

Q: Is this motor compatible with the ax 15 five speed transmission and if not is their one that is i drive a 94 yj se Answer this question

A: Not sure but we do no longer can get stroker engines. You might want to contact ATK directly.

Answered by Kelly from 4WP Corporate Headquarters on 07/19/2021

Q: Will this require special tuning and is it a direct replacement for the inline 6 in a 99 Cherokee sport Answer this question

A: Completely replaces the 4.0L engine but additional modifications might be required. Please call our sales line with your VIN number for more clarification. Toll Free: 1-877-474-4821

Answered by Kelly from Ohio on 09/29/2020

Q: would it come with the valve cover and header by any lucky chance? if not what should i look for? Answer this question

A: Hello It does not come with the valve cover or header. The header i like is the one made by Borla. They fit very well and a very high quality. As for the valve cover any of the stock covers or aftermarket will work for the year of motor. Thanks

Answered by Rody on 10/08/2015


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