Mountune's extensive knowledge of the Ford EcoBoost engines coupled with our comprehensive motorsport experience provides the foundation for our high performance 4.1L Ford EcoBoost short block assembly.

Each short block starts off as a brand new aluminum Ford F-150 Raptor open deck engine block that has been precision machined in house to accept Darton MID Sleeves before being skillfully assembled with mountune forged pistons, forged h-beam connecting rods, tri-metal racing bearings, and a forged steel crankshaft.

The Darton MID Sleeve is a proven method of strengthening open deck engine blocks while maintaining OEM integrity. It prevents cylinder cracking, walking, and bell mouthing and allows for a much larger cylinder bore size.

This engine is the perfect foundation for your F-150 Raptor for high boost applications or as a direct replacement for your tired original engine.

Product Code: 6000-SB-400
Base Engine: 3.5L Ford Ecoboost
Bore x Stroke: Ø 97 mm x 91.5 mm
Compression Ratio: 10:1
Piston: Upgraded Forged Piston
Connecting Rod: Mountune Forged H Beam Rod
Crankshaft: Steel Billet Steel Crankshaft
Main Bearing: Mountune Race Tri-Metal
Main Bolts: OEM High-Tensile Strength
Application: F-150 Raptor 2017-2020 and all Gen2 powered trucks

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.

Complete Short Block Engines

mountune High Performance 3.5L F-150 Raptor Short Block

mountune High Performance 4.1L V6 Stroker Sleeved F-150 Raptor Short Block