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mountune High Performance 1.6L MRX Fiesta ST Long Block

Mountune MRX High Performance 1.6L Long Block (6064-Lb-160S2) | Mountune

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Availability: Built to order. Ships in approximately 8-10 Weeks
Product Code: 6064-LB-160S2

Crankshaft Upgrade*:
Standard Crankshaft
mountune Lightweight Crankshaft [Add $1,399.00]

Description Installation Guide

mountune High Performance 1.6L MRX Fiesta ST Long Block

Fiesta ST 1.6L
Fusion 1.6L
Escape 1.6L

mountune’s extensive knowledge of the Ford EcoBoost engine coupled with broad motorsport experience provides the foundation for our Premium High Performance MRX 1.6L Ford EcoBoost long block. Each long block is skillfully assembled using a brand new Ford ST engine block that has been precision machined to accept a Cylinder Support System. The Cylinder Support System is a proven method of strengthening open deck engine blocks while maintaining OEM integrity. It prevents cylinder cracking, walking, and bell mouthing. The support ring is made from aircraft grade 6061-T6 aluminum.

mountune Forged Pistons, Forged Connecting Rods, bearings and a genuine new Ford crankshaft are installed all balanced to motorsport standards. This long block is the perfect foundation for your Fiesta ST for high boost applications including track day use. We take the guess work out of critical engine assembly allowing you to install your existing base engine components to this premium improved foundation. Tested at over 400hp, this engine specification is designed for typical track day use and those running high power levels with supporting modifications.

Long Block Features
The genuine Fiesta ST engine block is first inspected and then de-burred. The Cylinder Support System is then installed using precision CNC machining. Once the Cylinder Support is installed, we machine the engine block deck to ensure a smooth flat surface allowing perfect head gasket sealing. The bores are honed to perfection to receive mountune Forged Pistons. Every rotating assembly is balanced to within .5 gram. We also include our oil control baffle to ensure uninterrupted oil to vital engine components.

The select parts are professionally assembled by one of mountune's skilled engine builders. Each assembly includes a detailed data sheet showing all critical engine dimensions and a mountune serial number.

We then install one of our MRX cylinder heads using ARP Head studs to ensure maximum sealing between the block and head. Camshaft timing is set and all cam drive components are installed and set to correct specifications.

All NEW Components - No Core Charge

  • New Ford EcoBoost Fiesta ST Engine Block
  • Cylinder Support System Block Upgrade
  • mountune ICR Head Gasket
  • New Ford Crankshaft
  • mountune Forged H-beam Connecting Rods
  • mountune Forged Pistons and rings
  • Assembly balanced to within .5 gram
  • Complete blue-print assembly
  • Ring gap set
  • Bearing clearance set
  • Deck height checked
  • Connecting Rod side clearance set
  • Crankshaft end float set
  • New Ford Cylinder Head
  • Piper Mountune Camshafts
  • New Ford Water Pump
  • New Ford Timing Belt
  • New Ford Crankshaft Pulley
  • New Ford Camshaft Sprockets
  • ARP Head Studs
  • Mountune Oil Control Baffle
  • New Ford Oil Cooler Assembly
  • New Ford Oil Pump

Cylinder Head Features
The mountune MRX Cylinder head upgrade for the 1.6L EcoBoost (Fiesta ST) features dyno and flow bench tested improvements that produce maximum reliable power across a wide RPM range. Each cylinder head is based on a new genuine Ford ST casting that is inspected before receiving a precision NEWEN valve seat profile. The throat of each port is opened up to remove obstructions and then blended into the valve seat to improve flow.
Each head is then ultrasonically cleaned before assembly by one of our motorsport professionals using Supertech High Performance Valves along with upgraded valves springs matched to our V2 camshafts. This head is ideal for those running a larger than stock turbocharger.
  • Intake airflow is improved by 51% and exhaust air flow is improved by 24% compared to an otherwise stock 1.6L EcoBoost Cylinder head.
  • Intake valve seats feature multi angle profile, Exhaust valve seats feature radiused profile.
  • Increased power and torque
  • Assembled from all new parts, no core is required
  • Dyno and flow bench proven

Camshaft Features:
Power Band 2000-7000 rpm
Intake Duration 260° (OE Duration 228°)
Exhaust Duration 244° (OE Duration 212°)
Intake Valve Lift 8.64mm (OE 7.59mm)
Exhaust Valve Lift 7.32mm (OE 6.19mm)

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.

Owning a Mountune Racing Engine has never been easier!

We offer multiple options to make obtaining your own Mountune USA custom engine assembly simple. 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.

You can also take advantage of 6 months of no interest financing of your Mountune long block or short block engine assembly on approved credit with PayPal Credit. For more information click here.

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 at
info@mountuneUSA.com or to order by phone call 714-424-9400.

Recommended product
2.0L EcoBoost Oil Control System Oil Pump, 2.0L and 2.3L EcoBoost mountune Oil Breather Plate - Ford EcoBoost 2.0L and 2.3L



2.0L Ecoboost Oil Control System (2363-Oc-Aa) - Motorsport Engines & Components | Mountune Oil Pump, 2.0L Ecoboost (F2GZ-6600-A) - Motorsport Engines & Components | Mountune Breather Plate, Ford Ecoboost 2.0L & 2.3L (2363-Obp-Aa) | Mountune

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 1 Write a review »

  1 of 6 people found the following review helpful:
5 of 5 The boot 3.0 February 11, 2020
Reviewer: MRX430 from Murica  
Blew a head gasket on the MRX short block so I decided to have MountuneUSA build a complete long block. This is going to be mated to an EFR 6758 twin scroll, Peron twin scroll manifold, 3 in sport dp mated to a Thermal 3 in cbe.  Everything will be ceramic coated from the manifold to the tips of the exhaust. I want 430 hp at the wheels hence MRX430 now. Yeehaw!

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