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.

Installation Guides

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

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Mountune Racing Engines

mountune High Performance 2.3L MRX Stroker Focus ST Long Block

mountune High Performance 2.3L MRX Stroker Focus ST Long Block

SKU:6063-LB-233

Regular price $9,809.10
Regular price $10,899.00 Sale price $9,809.10
Sale Sold out

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 ST engine block then skillfully assembled with mountune Focus RS forged pistons, Focus RS forged i-beam connecting rods, tri-metal racing bearings, and a keyed OEM Focus RS crankshaft.

Each High Performance 2.3L MRX Long Block is topped with a mountune MRX Cylinder Head - Focus ST. A factory Focus ST cylinder block that has undergone our precision MRX machining service for the best possible performance, increasing intake airflow by 44% and exhaust airflow by 19%.

The mountune MRX cylinder head for the Focus ST 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.

This engine is the perfect foundation for your Focus ST for high boost applications including track day use or as a direct replacement for your tired original engine.

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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  • PARTS INTENDED FOR COMPETITION USE ONLY
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  • PROPOSITION 65 WARNING
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Additional Information:

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Engine Specifications

  • Product Code: 6063-LB-233
  • Base Engine: 2.0L Ford Ecoboost
  • Bore x Stroke: Ø 87.5 mm x 94 mm
  • Compression Ratio: 9.5:1
  • Piston: Upgraded Forged Piston
  • Connecting Rod: Mountune Forged I Beam Rod
  • Crankshaft: OEM Focus RS w/ 3mm Key
  • Main Bearing: Mountune Race Tri-Metal
  • Main Bolts: OEM High-Tensile Strength
  • Application: Focus ST 2013-2018

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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