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mountune High Performance 2.3L Focus RS / Mustang Short Block

Mountune High Performance 2.3L RS Mustang Short Block (6069-Sb-230) | Mountune

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Sale price:$5,309.10
Savings: $589.90

Availability: Usually Ships in 6 to 8 Weeks
Product Code: 6069-SB-230

2.3L Block Upgrades*:
No Additional Upgrades
Cylinder Support System [Add $750.00]

Crankshaft Upgrade*:
Standard Crankshaft
mountune Lightweight Crankshaft (includes keyed & pulley) [Add $1,700.00]

Keyed Crankshaft*:
No Thanks
Yes [Add $300.00]

Description Installation Guide

mountune High Performance 2.3L Focus RS/Mustang EcoBoost Short Block

Ford EcoBoost 2.3L
Focus RS 2016-2018
Ford Mustang EcoBoost 2.3L 2014+

mountune’s extensive knowledge of the Ford EcoBoost engine coupled with broad motorsport experience provides the foundation for our Premium High Performance 2.3L Ford EcoBoost short block. Each short block is skillfully assembled using a brand new Ford RS engine block coupled with Mahle Forged Pistons, Forged Connecting Rods, high performance bearings and an RS forged crankshaft. This short block is the perfect foundation for your Focus RS or Mustang EcoBoost for high boost applications including track day use. We take the guess work out of critical engine assembly allowing you to install your existing cylinder head and other base engine components to this premium improved foundation. We also include our RS oil control pan upgrade and a new mountune ICR head gasket.

Short Block Features
The genuine RS engine block is first inspected, de-burred, and the bores are honed to perfection to receive Mahle Forged Pistons. The rotating assembly that includes a Ford RS Forged 94mm crankshaft (keyed option and lightweight option available) and Forged I-Beam Connecting Rods is balanced to within .5 gram. The select parts are professionally assembled by one of mountune's skilled engine builders using tri-metal race spec bearings. Each assembly includes a detailed data sheet showing all critical engine dimensions.

  • Bore: 87.5mm
  • Stroke: 94 mm
  • Compression Ratio 9.5:1
  • mountune Light Weight Crank Option

  • New Ford EcoBoost RS Engine Block
  • New Forged 94mm Crankshaft *Optional Lightweight Crank
  • Forged I-Beam Connecting Rods
  • Mahle Forged Pistons and Rings
  • mountune Tri-Metal Bearings with Locating Tang
  • Assembly balanced to within .5 gram
  • Complete blue-print assembly
  • Ring gap set
  • Bearing clearance set
  • Deck height checked
  • Connecting Rod side clearance set
  • Crankshaft end float set
  • Balance Shaft Delete included
  • mountune Oil Control System (RS application only)
  • mountune ICR Head Gasket
  • Keyed crank with matching chain sprocket and crankshaft pulley (optional extra cost)

Piston Features
Engineered in house by our motorsport division and manufactured exclusively by our partner Mahle Motorsports, the mountune forged piston set for the 2.3L Ford EcoBoost is a fully featured piston with many of the same upgrades we use in our professional motorsport engines. Produced from modern lightweight alloy forgings for severe duty , each piston features supported pin bosses to withstand the extreme conditions found in engines operating with high cylinder pressures. The layout of the piston has also been optimized with weight reduction in mind and reduced skirt profiles to minimize friction. Mountune pistons also include gas accumulator grooves developed during extensive testing and tailored for the EcoBoost engine. Careful consideration has been used in the “bowl” area of the piston to maintain Ford’s original profile to ensure proper and efficient combustion. Tool steel internally tapered, short wrist pins are used to reduce pin flex and weight. Mountune connecting rods are recommended to ensure a matched set of components. As an added feature, Mahle's phosphate dry lubricant coating is used on the entire piston to reduce micro-welding and pin galling. Additionally, Mahle's Grafal skirt coating is used on the piston skirt to reduce cylinder wall friction reduction

Connecting Rod Features
The connecting rod is one of the most highly stressed components within the engine and improved connecting rods are an essential upgrade for high power EcoBoost engines. Our Forged I Beam connecting rod was developed using extensive FEA analysis resulting in the optimum connecting rod for applications up to 200 bhp per cylinder. Made in the USA to our specifications, each connecting rod incorporates our motorsport DNA to provide you with the ultimate component for your engine. Exclusive features include a robust, I – Beam configuration with extensive machining to optimize weight without reducing strength. All edges and corners are radiused to improve durability.

As an added upgrade, mountune connecting rods feature machined tangs to securely locate the rod bearings. Compared to the factory press fit tangless bearings, this feature ensures improved bearing retention in high cylinder pressure and high RPM engines. Tool steel connecting rod bolts are also standard and are superior to most bolts found in other rods on the market. Silicone/bronze pin bushings provide a durable and low friction surface that remains dimensionally stable in high pressure and high RPM applications.

This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards. Click Here for Emissions compliance information.

Owning a Mountune Racing Engine has never been easier!

We offer multiple options to make obtaining your own Mountune USA custom engine assembly simple. With a 50% deposit we can start your engine assembly process. The remaining balance will be due upon completion of your long block or short block engine.

Use code DEPOSIT50 at checkout to pay the deposit on your engine assembly. Upon your engine’s completion we will contact you to collect final payment for the remaining balance.

You can also take advantage of 6 months of no interest financing of your Mountune long block or short block engine assembly on approved credit with PayPal Credit. For more information click here.

Please note engine assemblies, both long and short blocks, are considered custom products and cannot be returned. Additionally, once the engine build and assembly process has begun, the order cannot be canceled.

For more information please contact us at
info@mountuneUSA.com or to order by phone call 714-424-9400.

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Sale price:$499.00



Oil Pump, 2.0L Ecoboost (F2GZ-6600-A) - Motorsport Engines & Components | Mountune 2.3L EcoBoost Engine Gasket Set - Motorsport Engines & Components | Mountune 2.0L Ecoboost Oil Control System (2363-Oc-Aa) - Motorsport Engines & Components | Mountune Breather Plate, Ford Ecoboost 2.0L & 2.3L (2363-Obp-Aa) | Mountune

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 1 Write a review »

  1 of 1 people found the following review helpful:
5 of 5 Very Happy! July 13, 2020
Reviewer: Michael Kulp from College Point, NY United States  
I just received my short block with the Darton Sleeves/Lightweight Crank options. After a side by side comparison with my OEM block, I immediately knew that I made the right choice, the build quality is very impressive. I bought my  RS with the intention to heavily modify it and after installing full bolt-ons including Mountune's head with V3 cams, I added a bit too much boost and tossed a rod (#2 cylinder). I did a lot of research before making this purchase and Mountune was the only builder I could find who starts with a new RS 2.3 block. I found cheaper builds, but all were based on 2.0 blocks modified to fit 2.3 internals - this block in my opinion is worth every penny. I've purchased many performance upgrades from Mountune and have always received great tech advise, service and timely deliveries.

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