AMS Mitsubishi Lancer Evolution 4G63 2.3RR Short Block


This is the ultimate in road racing power plants providing low RPM torque AND top end horsepower.

SKU: AMS.01.04.0023- Category: Tags: , , , , , , , , , ,


The AMS EVO IV-IX 2.3RR Short Block is an AMS EXCLUSIVE!  This is the ultimate in road racing power plants providing low RPM torque AND top end horsepower. This is the same race-proven engine that powered AMS TA1 to Overall Championship Wins in the 2009 & 2010 Caribbean Motor Racing Championship Series.  

Engineered For Maximum Output Across The Entire Power-Band

In 2006 we set out to engineer and build an engine that has the RPM range of a 2.0L and the low RPM torque of a stroker.  Rod ratio, rod length, and bore to stroke ratio were optimized to support high volumetric efficiency at all RPMs.  What we ended up producing was an engine with the broadest power band in the industry!

Our Race Winning Experience Creates Higher Standards

This is not an off the shelf combination, no expense was spared on this motor.  It is stuffed full of only the absolute BEST parts available.  The foundation of this motor is an extended deck height block expertly machined to AMS specifications.  Extra thick cylinder walls are bored and honed to accept 2.3RR AMS spec pistons which are hard anodized and have a friction reducing skirt coating applied.  The pistons have been specially designed for strength while reducing weight to minimize stress on wrist pins, rods and bearings.  Our custom length, light weight 4130 billet rods are held to the crank with ARP 625+ Custom Age rod bolts.  The rotating assembly is specifically designed for high strength and is meticulously balanced to the gram.

Do it right the first time, order your AMS 2.3RR engine today!



Exclusive Benefits

  • AMS prepped extended deck height block with custom oil squirters
  • Copper O-ringed deck
  • Crank is knife edged and gun drilled for weight reduction
  • AMS spec pistons with slipper skirt for shorter, lighter wrist pin
  • Choice of compression ratios
  • 2.27 L displacement
  • No core charge required
  • Comes completely assembled and balanced


  • Extended deck height block completely machined *
  • Manley “Turbo Tuff Series” Crankshaft 4340 Billet
  • Manley “Turbo Tuff Series” I-Beam rods
  • Manley Lightweight Stroker Pistons
  • ARP Main studs
  • Custom MLS head gasket for proprietary bore size
  • New Mitsubishi oil pump
  • New Mitsubishi water pump
  • AMS race balance shaft
  • Full assembly by AMS
  • Detailed installation guide


  • 9.5:1 –  Is good for most street and race applications. This can be tuned to make great power on pump gas & race gas
  • 10.0:1 –  Provides great power and response on race gas for track or strip. This can be run on pump gas with caution. (93+ octane only)
  • 2.27 L displacement


  • Mitsubishi Evolution 4, 5, 6, 7, 8, 9
  • GSR, MR, RS and SE
  • Fits all USDM, JDM and European models

 Product Notes

  • Please specify when ordering if you would like 9.5:1 compression or 10.0:1 Compression
  • Please specify when ordering if you have MIVEC

Please call to order.


Please read these tech articles before installing a new engine:

It’s easy to get overwhelmed with information when shopping for an engine. 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!

Additional information

Weight 300 lbs



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By utilizing research and development and rigorous testing programs AMS will never compromise the quality or performance of our products.

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