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AMS 4G63 2.3RR Short Block for Evo 4-9



Please contact us to purchase!

Vehicle Fitment:
1996-2006 Mitsubishi Lancer Evolution IV V VI VII VIII IX

Purchase Information: (Please call us to order!)
• We prefer to handle this one-on-one to ensure all details are correct.
• No core required! These are built using a new OEM block
• Please allow 4-8 weeks for build times.
• Ships to the continental USA only.

With an increase in displacement to 2.3 liters, you can expect a 10-15% increase in torque and a 400-500 rpm increase in spool up. Road racers will pull through corners better and drag racers will benefit from boost response after shifts. 

Specs and Features:

AMS Exclusive Features:
• 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
• 2.27L 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

• 2.27 Liter Displacement

• 9.5:1 – 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).


The AMS Evo IV/V/VI/VII/VIII/IX 2.3RR Motor 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!

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!

© All images are property of STM Tuned Inc

© All images are property of STM Tuned Inc

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