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.

Important Notice: Extended Lead Times

Due to high demand and ongoing parts supply delays, our custom-built-to-order engines are experiencing extended lead times. We’re committed to quality and appreciate your patience. For the latest lead time estimates, please contact us.

2.3L EcoBoost Engine Assemblies

mountune High Performance 2.3L MRX Focus RS Long Block

mountune High Performance 2.3L Focus RS/Mustang Short Block

mountune High Performance 2.3L EcoBoost N1 Long Block - Focus RS