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

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

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.


  • Ford EcoBoost Gen 2 V6 Engine Block
  • Callies 91.44mm Steel Crankshaft
  • Forged Connecting Rods
  • Forged 97mm Pistons
  • High Performance main and rod bearings
  • 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
  • Rear Main Seal installed
  • MLS Head Gasket Set

Engine Build Specifications

Product Code 6000-SB-400
Base Engine 3.5L Ford Ecoboost
Bore x Stroke Ø 97 mm x 91.44 mm
Compression Ratio 10:1
Upgraded Forged Piston
Connecting Rod Mountune Forged H Beam Rod
Crankshaft Callies Billet Steel Crankshaft
Main Bearing Mountune Race Tri-Metal
Main Bolts Premium Grade 8740 Alloy
Application F-150 Raptor 2017-2020 and all Gen2 powered trucks

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.

Regular price $14,398.99
Regular price $15,999.00 Sale price $14,398.99
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.