Mountune’s extensive knowledge of the Ford EcoBoost engine coupled with broad motorsport experience provides the foundation for our Closed Deck High Performance 2.3L Ford EcoBoost short block. Each short block is skillfully assembled using a brand new genuine Ford RS 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.
We then add Mahle Forged Pistons, Forged Connecting Rods, high performance bearings and an RS forged crankshaft. This short block is the perfect foundation for your Focus RS for high boost applications including track day use. We take the guess work out of critical engine assembly allowing you to install your existing cylinder head and other base engine components to this premium improved foundation. This engine specification is designed for typical track day use and those running up to 575hp power levels with supporting modifications.

The genuine RS engine block is first inspected, de-burred, and the bores are honed to perfection to receive Mahle Forged Pistons. The rotating assembly that includes a Ford RS Forged 94mm crankshaft (keyed option and lightweight option available) and Callies Forged Connecting Rods is balanced to within .5 gram. The select parts are professionally assembled by one of Mountune's skilled engine builders using tri-metal race spec bearings. Each assembly includes a detailed data sheet showing all critical engine dimensions.

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.