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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

All NEW Components - No Core Charge

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

Our 2.3L EcoBoost MRX cylinder head also features high-performance black nitrided intake valves, sodium Inconel exhaust valves, 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 256º (OE Duration 234º)
Exhaust Duration 244º (OE Duration 224º)
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 the 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 264º (OE Duration 234º)
Exhaust Duration 256º (OE Duration 224º)
Intake Valve Lift 10.85mm (OE 8.00mm)
Exhaust Valve Lift 9.70mm (OE 6.99mm)

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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Estimated Build Times

For built-to-order engine assemblies, the current estimated build time is 10-12 weeks (As of August 2023)

Please note, that there may be circumstances that may delay the build process including (but not limited to) part shortages and backorders beyond our control.

For more information please contact us.

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.

For more information visit

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  • Easy Financing Options Available

    Buy now, pay later payment options are offered by Affirm and are subject to eligibility. Select ShopPay monthly installments at checkout.

  • 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.