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mountune High Performance 2.3L MRX Stroker Focus ST Long Block

mountune High Performance 2.3L MRX Stroker Focus ST Long Block

Mountune's extensive knowledge of the Ford EcoBoost engines coupled with our comprehensive motorsport experience provides the foundation for our premium 2.0L 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.

Engine Build 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
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 Premium Grade 8740 Alloy
Application Focus ST 2013-2018

Each High Performance 2.0L 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.

Also included: mountune COMPLETE OIL CONTROL SYSTEM, mountune HIGH PRESSURE OIL PUMP - 2.0L/2.3L ECOBOOST, and OEM head gasket

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.

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 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)

Regular price $10,419.00
Regular price $10,419.00 Sale price $10,419.00
Sale Sold out

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.