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mountune High Performance 2.3L MRX Focus RS Long Block

mountune High Performance 2.3L MRX Focus RS Long Block

Mountune’s extensive knowledge of the Ford EcoBoost engines coupled with our comprehensive motorsport experience provides the foundation for our premium 2.3L Ford EcoBoost long block assembly.

Each long block starts off as a brand new aluminum Ford Focus RS engine block strengthened with the Cylinder Support System then skillfully assembled with mountune forged pistons, forged i-beam connecting rods, tri-metal racing bearings, and a lightweight forged crankshaft.

There is also an optional upgrade to our lightweight forged crankshaft with an overall weight reduction of 9 lbs from stock for maximum performance and excellent engine response.

Engine Build Specifications

Product Code 6069-LB-230HP
Base Engine 2.3L Ford Ecoboost
Bore x Stroke Φ 87.5 mm x 94 mm
Compression Ratio 9.5:1
Upgraded Forged Piston
Connecting Rod Mountune Forged I Beam Rod
Crankshaft Lightweight Forged w/ Keyed Snout
Main Bearing Mountune Race Tri-Metal
Main Bolts Premium Grade 8740 Alloy 
Application Focus RS 2016-2018 

Each High Performance 2.3L MRX Long Block is topped with a mountune MRX Cylinder Head - Focus RS

A factory Focus RS cylinder block which has undergone our precision MRX machining service for the best possible performance, increasing intake airflow by 44% and exhaust air flow by 28%.

Our 2.3L EcoBoost MRX cylinder head also features high-performance black nitrided intake valves, sodium inconel exhaust valves, along with our motorsport valve stem seals, and your choice of V2 or V3 camshafts.

The V2 Camshafts offer good all around drivability while providing excellent power and response. We recommend these for most applications.

V2 Camshaft Specifications:

Intake Duration 256°  (OE Duration 234°)
Exhaust Duration 244°  (OE Duration 224°)
Intake Valve Lift 9.60 mm  (OE 8.00mm)
Exhaust Valve Lift 8.53 mm  (OE 6.99mm)

The V3 Camshaft option works well with larger than stock turbochargers and enhances high RPM power level. Because of the longer duration and higher lift, rough idle should be expected and considerable tuning effort may be required for these camshafts to function correctly.

V3 Camshaft Specifications:

Intake Duration 264° (OE Duration 234°)
Exhaust Duration 256° (OE Duration 224°)
Intake Valve Lift 10.85mm (OE 8.00mm)
Exhaust Valve Lift 9.70mm (OE 6.99mm)

Also included: mountune COMPLETE OIL CONTROL SYSTEM, mountune HIGH PRESSURE OIL PUMP - 2.0L/2.3L ECOBOOST, and mountune ICR HEAD GASKET

This engine specification is designed for typical track day use and those running up to 550 hp power levels with the proper supporting modifications.

Cylinder Support System Information

The Cylinder Support System is a proven method of strengthening open deck engine blocks while maintaining OEM integrity. The support ring is made from aircraft grade 6061-T6 aluminum. It prevents cylinder cracking, walking, and bell mouthing.

Regular price $14,499.00
Regular price $14,499.00 Sale price $14,499.00
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Build Times & Shipping Information

CURRENT BUILD TIME: 10-12 Weeks (As of March 2023)

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.

Engine assemblies ship anywhere in the continental USA for one of two flat rates. Long block assemblies ship for a flat rate of $350. Short block assemblies ship for a flat rate of $100.

Installation & Break-In Process

To see all available installation and break-in instructions, click here.

Warranty information

Mountune is confident in our products and services and we proudly stand behind our workmanship. Therefore, we offer a limited warranty against defects in workmanship or materials, covering both parts and labor, for a standard period of 1-Year/12,000-Miles.

For more information see, terms & conditions.

Disclaimers & Legal

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.

California Residents Prop 65 Information
California’s Proposition 65 entitles California consumers to special warnings for products that contain chemicals known to the state of California to cause cancer and birth defects or other reproductive harm if those products expose consumers to such chemicals above certain threshold levels. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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  • Start your engine with a Deposit

    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.

    Contact us for more information 
  • Flat-Rate Freight Shipping

    Engine assemblies ship anywhere in the continental USA for one of two flat-rates. Long block assemblies ship for flat-rate of $350. Short block assemblies ship for a flat-rate of $100.