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mountune High Performance 2.3L MRX Focus RS Long Block

mountune High Performance 2.3L MRX Focus RS Long Block


Regular price $13,774.05
Regular price $14,499.00 Sale price $13,774.05
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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.

Our lightweight forged crankshaft with an overall weight reduction of 9 lbs from stock for maximum performance and excellent engine response.

2.3L MRX Long Block is topped with a mountune MRX Cylinder Head - Focus RS. 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.

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.

Camshaft Information

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

Find the important information you need to install this engine into your build, as well as our recommended break-in procedure.

Additional Information:

Engine 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
  • Piston: Upgraded Forged Piston
  • Connecting Rod: Mountune Forged I Beam Rod
  • Crankshaft: Lightweight Forged w/ Keyed Snout
  • Main Bearing: Mountune Race Tri-Metal
  • Main Bolts: OEM High-Tensile Strength
  • Application: Focus RS 2016-2018

Included Components

Warranty Coverage

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.

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Engines Built To Order

Estimated build time is currently 10-12 weeks

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.


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