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 1.6L MRX Fiesta ST Long Block

mountune High Performance 1.6L MRX Fiesta ST Long Block


Regular price $8,425.55
Regular price $8,869.00 Sale price $8,425.55
Sale Sold out

Mountune's extensive knowledge of the Ford EcoBoost engines coupled with our comprehensive motorsport experience provides the foundation for our premium 1.6L Ford EcoBoost long block assembly.

Each long block starts off as a brand new aluminum Ford Fiesta ST engine block strengthened with the latest Cylinder Support System then skillfully assembled with mountune forged pistons, forged h-beam connecting rods, and tri-metal racing bearings—with an optional mountune Fully Counterweighted Crankshaft available.

1.6L MRX Long Block is topped with a mountune MRX Cylinder Head - Fiesta ST. A factory Fiesta ST cylinder block that has undergone our precision MRX machining service for the best possible performance, increasing intake airflow by 51% and exhaust airflow by 24%.

Our 1.6L EcoBoost MRX cylinder head also features high-performance black nitrided intake valves, sodium inconel exhaust valves, along with our motorsport valve stem seals, and V2 camshafts.

This long block is the perfect foundation for your Fiesta ST for high-boost applications including track-day use.

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 and features full support between each cylinder. 

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Additional Information:

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Engine Specifications

  • Product Code: 6064-LB-160S2
  • Base Engine: 1.6L Ford Ecoboost
  • Bore x Stroke: 79mm x 81.4 mm
  • Compression Ratio: 10.1:1
  • Piston: Upgraded Forged Piston
  • Connecting Rod: Mountune Forged H Beam Rod
  • Crankshaft: OEM Fiesta ST
  • Main Bearing: Mountune Race Tri-Metal
  • Main Bolts: OEM High-Tensile Strength
  • Application: Fiesta ST 2014-2019

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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