AMS Mitsubishi Lancer Evolution X 4B11 2.4L Big-Bore Crate Engine


Important Note: We now use AMS spec sleeves 

For those of you looking for a big-bore stroker version of the 4B11 engine, look no further than the AMS EVO X 2.4L Big Bore Stroker! By increasing displacement to a robust 2.4 liters, this powerplant allows you to run a larger turbo for increased horsepower without sacrificing your power-band.

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Turn Key, Ready to Drop In Crate Motor!!

For those of you looking for a big-bore stroker version of the 4B11 engine, look no further than the AMS EVO X 2.4L Big Bore Stroker! By increasing displacement to a robust 2.4 liters, this powerplant allows you to run a larger turbo for increased horsepower without sacrificing your power-band.

The AMS EVO X 2.4L Big-Bore Stroker Crate Engine is the ultimate solution for high horse power reliability. Our crate engine comes complete from valve cover to oil pan to timing chain and components to make installation as painless as possible. This package uses only the best products we sell and comes ready to drop right into your EVO.

Big Torque For Quicker Turbo Response

If you are running an upgraded turbo system, the Big Bore Stroker improves torque numbers down low by increasing stroke. 500 ft/lbs can be achieved as early as 4200rpm with the appropriate turbo system. Off the dyno, full spool can be achieved at just above 4000rpm. With the added torque, you will power out of turns quicker for improved lap times on the road course and leave your opponents in the dust on the street!

AMS Keeps You Ahead Of The Competition With A HUGE Power-Band

Big power is great but often comes with a narrow power-band and having to wait for your turbo to spool. What’s most impressive about this new engine configuration is it adds torque down low and that torque carries all of the way to redline. In addition, horsepower continues to climb all the way up to the maximum rev limit of 8500rpm. With such a wide power-band your EVO X will be unbeatable on the street or the track with big power and monster torque on tap at nearly any rpm

The Perfect Combination for Power and Durability

This race proven power plant uses only the best off the shelf and custom designed AMS spec. components. Combine that with the latest in machine and assembly practices and you are assured only the best!

Each block is precisely machined to accept the latest AMS spec sleeves. The sleeves are pressed into the block to sit atop a machined step to ensure they will not sink during engine operation. The block is then final bored & honed using a torque plate to ensure perfect clearances and fitment. The finished product allows for higher cylinder pressures and added strength and rigidity of your block. Couple that with Manley pistons made with extra thick ring lands, skirt coatings and upgraded 9310 alloy wrist pins we achieve maximum reliability for your 4B11 rebuild.

To top off this package we include the AMS EVO X CNC Ported Cylinder Head. Featuring the most advanced port design on the market, this head is fortified with +1mm oversized Ferrea valves and valvetrain components. The flow at low, mid and high lift have been optimized to achieve the most effective power curve, something overlooked by the competition who focus on peak numbers. For camshafts we use the AMS “TMP” Camshafts complimenting the ported heads with massive peak and low end power making great turbo spool up characteristics. The perfect combo for an unbeatable machine!

Our Race Winning Experience Creates Higher Standards

All our race engines are individually handcrafted at AMS using the same care as the ones found in our world record holding street and race cars. When you choose an AMS engine you are investing in the knowledge gained from assembling thousands of race engines over the past 15 years. With over 350 Victories in Motorsports over the last 7 years alone, it is clear that AMS is the only choice for your engine rebuild!

Just like our 2000+HP Alpha Omega GT-R, every motor is balanced, blueprinted and assembled to AMS’ exacting standards. Before assembly each block is checked for correct dimensions, cylinder bore, mains, block flatness, etc… to ensure you get the best foundation for your new engine. Every engine we assemble has a build sheet where tolerances, torque specs, and clearances are documented.

Complete Crate Engine For Ease Of Installation

The AMS Big-Bore Stroker Crate Engine comes complete and sealed from valve covers to oil pan. The engine is timed and the front covers installed so all of the hard work is already done for you making your engine swap a bolt-in affair.

Do it right the first time, order your AMS 2.4L Big-Bore Stroker today!

Exclusive Features

  • Big torque increase combined with 9,000 peak RPM capability
  • Flat torque curve from 4200rpm all the way to redline
  • Increased displacement for more horsepower
  • Balanced and blueprinted with precise, documented assembly
  • Comes fully assembled, valve cover to oil pan, ready for installation
  • Your choice of compression ratio
  • Available outright or with core exchange*


  • AMS Sleeved AMS Block
  • Precision AMS spec machine work on block & crank
  • Manley Pistons w/ skirt coating & 9310 alloy wrist pin upgrade
  • Manley “Turbo Tuff” I-Beam rods
  • High performance racing rod & main bearings
  • ARP main studs
  • AMS spec big-bore head gasket
  • AMS CNC ported cylinder head
  • +1mm oversized Ferrea valves and valvetrain components
  • ARP head studs
  • AMS TMP camshafts
  • Comes complete and sealed from valve cover to oil pan, timed and ready to install


  • Displacement: 2.4 liters
  • Stroke: 94mm
  • Bore:  90mm
  • Compression Ratio:
    • 9.5:1 Street (best suited for pump gas)
    • 10.5:1 Race (best suited for race gas, careful tuning required for pump gas)
  • Suggested Rev Limit:
    • 8500RPM street/road course
    • 9000RPM drag racing


  • Mitsubishi Evolution 10 GSR and MR Models
  • Fits all USDM, JDM and European Model

Tech Articles

Product Notes

  • It’s easy to get overwhelmed with information when shopping for a new 4B11 motor. With all the engine programs and options available in the AMS catalog we recommend that you call in and talk to one of our trained professionals before making your decision. We can help you find the perfect engine for your application and performance needs. No matter what your performance goals may be we will get you an engine that best suits your needs…no more and no less. So give us a call!
  • *AMS Core Exchange Program for a crate motor requires a complete engine from valve cover to oil pan including a usable block.

Additional information

Weight 150 lbs
Dimensions N/A

9.5:1, 10.5:1


No Core, Core


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Some AMS Performance upgrades may solely be used on vehicles in sanctioned competition which may never be used upon a public road or highway, unless permitted by specific regulatory exemptions (such as a CARB E.O.). For state specific details please visit the following website:

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All performance modifications and installations are at the customer’s own risk. AMS Performance holds no responsibility either implied or otherwise for mechanical, electrical or other failure when using any aftermarket performance products.