About the 6.4 Powerstroke Engine

Are you searching for a used 6.4 Powerstroke engine for your 2008 to 2010 Ford Super Duty? You've come to the right place for honest information about this engine. The Ford / Navistar 6.4L Powerstroke is a powerful V8 turbo diesel producing 350 HP and 650 lb-ft of torque, with a compound turbocharger setup that delivers strong power across the RPM range. However, the 6.4 Powerstroke has well-documented reliability concerns that any potential buyer should understand before making a purchase decision. We believe in honest disclosure: this page tells you both what's good about the 6.4 Powerstroke and what to watch for. Our goal is to help you make an informed decision so you get the right outcome for your truck.

6.4 Powerstroke Engine Overview

The 6.4 Powerstroke is a 6.4 liter V8 turbocharged diesel engine produced by International Truck and Engine Corporation (Navistar) for Ford Motor Company from 2008 through 2010 model years. It was the successor to the troubled 6.0L Powerstroke (2003 to 2007) and was itself replaced by the much-improved in-house Ford 6.7L Powerstroke for the 2011 model year. The 6.4 was the last Navistar-built Powerstroke engine: after the documented reliability problems with both the 6.0L and 6.4L, Ford terminated its long-running partnership with Navistar (which had supplied Powerstroke diesels since 1994) and began designing the 6.7L Powerstroke in-house. The 6.4 Powerstroke is closely related to the International MaxxForce 7 used in non-Ford commercial truck applications.

Honest Disclosure: What You Need to Know Before Buying a 6.4 Powerstroke

Before discussing the engine's specifications and features, we want to be upfront about the 6.4 Powerstroke's reputation in the diesel community. The 6.4 Powerstroke has documented reliability concerns that are widely known among Ford Super Duty enthusiasts and diesel technicians. Common failure modes include:

• Catastrophic Piston Cracking , especially in cylinders #2 and #7. The pistons can develop cracks that lead to coolant intrusion and complete engine failure.
• Dual EGR Cooler Failures , both EGR coolers (the 6.4 has two) commonly crack and leak coolant into the intake, causing white smoke and eventually hydrolock or coolant-related engine damage.
• Fuel-in-Oil Dilution , the HPCR fuel system can leak fuel into the engine oil through failed injector seals or fuel pump issues, leading to crankshaft bearing damage as the fuel-diluted oil loses its lubrication properties.
• DPF (Diesel Particulate Filter) Clogging , the 6.4 was the first Powerstroke with DPF, and the system is prone to clogging and constant regeneration, causing fuel economy degradation and potential downstream issues.
• Radiator Failures , the plastic radiator end tanks crack under thermal stress, causing coolant loss.
• Up-Pipe Cracking , the exhaust up-pipes from the heads to the turbo can crack at the welded joints, causing exhaust leaks and boost loss.
• HPFP (High-Pressure Fuel Pump) Failures , the high-pressure fuel pump can fail and contaminate the entire fuel system with metal particles.
• Poor Fuel Economy , the 6.4 averages 10 to 13 MPG in typical use, significantly worse than the 6.7L Powerstroke that replaced it.

Average lifespan without major repair is approximately 100,000 to 150,000 miles , significantly less than the legendary 7.3L Powerstroke (often 400,000 plus miles) or the modern 6.7L Powerstroke (250,000 plus miles routinely). The 6.4 Powerstroke was produced for only three model years (2008, 2009, 2010) precisely because of these concerns.

Why Then Would Someone Buy a 6.4 Powerstroke?

Despite the issues, there are valid reasons to source a used 6.4 Powerstroke:

• You own a 2008 to 2010 Ford Super Duty and need a replacement engine. Sourcing a used 6.4 is typically cheaper than swapping to a 6.7L or 7.3L (which would require ECM, harness, transmission, and fuel system changes).
• The strong factory power output , 350 HP and 650 lb-ft of torque, is competitive for its era and the compound turbo gives it strong towing characteristics.
• Aftermarket "bulletproofing" , the diesel performance community has developed extensive solutions for known 6.4 issues, including improved EGR coolers, stronger pistons, ARP head studs, fuel-in-oil mitigation, and DPF / EGR delete kits (for off-road and competition use only).
• Workhorse capability when maintained properly , owners who proactively address known issues with preventive bulletproofing often get 200,000 plus miles of reliable service.

6.4 Powerstroke Engine Technical Features

• Compound Turbocharger Setup: The 6.4 uses a compound turbo system (NOT simple parallel twin turbos as sometimes described). One smaller high-pressure turbo handles low-RPM boost; a larger low-pressure turbo handles high-RPM boost. The two turbos work in series for maximum boost capability across the entire RPM range.
• High-Pressure Common Rail Fuel Injection: Delivers fuel at extreme pressures (over 26,000 PSI) for optimized combustion efficiency.
• Dual EGR Coolers: Two EGR coolers help meet emissions regulations. Unfortunately, this is also a known failure point.
• Cast Iron Block and Heads: The 6.4 uses cast iron throughout (NOT aluminum heads as sometimes incorrectly listed) for durability. Some references describe the block as CGI (compacted graphite iron) for additional strength.
• 17.5:1 Compression Ratio: Standard for a heavy-duty diesel.
• OHV Pushrod Valvetrain with 4 Valves per Cylinder: 32 valves total provide good breathing for power output.
• DPF / DOC / Exhaust Aftertreatment: The 6.4 was the first Powerstroke with full diesel aftertreatment (DPF and DOC). No DEF / SCR yet (that came with the 6.7L).
• Exhaust Brake: Integrated exhaust brake helps manage speed on downhill grades, valuable for heavy towing.
• Advanced Cooling System: Heavy-duty radiator and oil cooler to handle the heat output of compound turbo operation.

The 6.4 Powerstroke Engine Vehicle Applications

The 6.4 Powerstroke is found exclusively in Ford Super Duty trucks:

• Ford F-250 Super Duty (2008 to 2010)
• Ford F-350 Super Duty (2008 to 2010)
• Ford F-450 Super Duty (2008 to 2010)
• Ford F-550 Super Duty (2008 to 2010)

The 6.4 was NOT used in:

• F-150 (which uses smaller engines)
• E-Series vans (Ford retained the older 6.0L Powerstroke in E-Series longer)
• F-650 / F-750 medium-duty (which used the larger Cummins ISB or Navistar MaxxForce engines)

Performance and Power

Factory specifications:

• Horsepower: 350 HP at 3,000 RPM
• Torque: 650 lb-ft at 2,000 RPM
• Modified Performance: With proper bulletproofing and tuning, the 6.4 can be safely modified to 500 to 600 HP. Beyond that, the engine internals become unreliable.

Why Choose a Used 6.4 Powerstroke Engine?

For owners of 2008 to 2010 Super Duty trucks needing engine replacement, a used 6.4 Powerstroke offers:

• Cost-effective alternative to new ($7,499 used vs $10,500 to $14,500 reman)
• Direct ECM and harness compatibility with your existing Super Duty wiring
• Maintains factory truck configuration (versus the substantial work required for a 6.7L or 7.3L swap)
• Strong factory power for towing and hauling when the engine is healthy

Recommended Aftermarket Bulletproofing for Long-Term Reliability

If you install a used 6.4 Powerstroke, we strongly recommend the following preventive bulletproofing modifications:

• Improved EGR coolers (Bullet Proof Diesel, Sinister Diesel) , addresses the #1 reliability concern
• ARP head studs , prevents head gasket failures under stress
• Coolant system upgrade (aluminum radiator) , replaces the failure-prone plastic end tank radiator
• EGR / DPF delete kit , for off-road and competition use only; significantly improves reliability and fuel economy but is not street legal in any US state
• Quality fuel filter system (S&B, FASS) , extends HPFP life by removing water and contamination
• Preventive fuel system flush , clears any pre-existing metal contamination from prior HPFP issues
• Forged piston upgrade (if budget allows) , eliminates the cylinder #2 and #7 piston cracking risk

Find Your 6.4 Powerstroke Today

Whether you're replacing a failed engine in your 2008 to 2010 F-250 / F-350 / F-450 / F-550, completing a Super Duty rebuild project, or sourcing a 6.4 Powerstroke for an aftermarket "bulletproofed" build, our selection of used 6.4 Powerstroke engines for sale comes with honest disclosure of mileage and condition. With our inspection process specifically targeting the known 6.4 wear points, you'll know exactly what you're getting before you commit.

Browse our inventory of 6.4 Powerstroke engines for sale, or contact our team for personalized recommendations matching your specific year and truck. Our knowledgeable team can also discuss bulletproofing strategies and alternative options like the 6.7L Powerstroke if you're considering an engine upgrade rather than direct replacement.

Vehicle Compatibility

Condition and Inspection

• Year verified (2008, 2009, or 2010 model year)
• Donor truck confirmed (F-250 / F-350 / F-450 / F-550)
• All 8 cylinders compression tested with results documented
• Oil sample analysis performed (fuel-in-oil dilution check)
• Piston inspection via borescope where possible (cylinder #2 and #7 crack check)
• Both EGR coolers inspected for cracks and coolant leaks
• DPF condition documented (clogging, mileage on regen cycles)
• Compound turbocharger function verified (HP and LP stages tested independently)
• HPFP fuel pressure verified
• Up-pipe inspection performed (known crack point at welded joints)
• Radiator and cooling system condition assessed
• Plastic radiator end tank inspection (known crack point)
• Block casting numbers documented
• Mileage from donor noted
• Honest disclosure of any known issues identified during inspection
• Honest disclosure of 6.4 Powerstroke known issues before you commit
• All 8 cylinders compression tested before shipping
• Oil sample analysis for fuel-in-oil dilution
• Piston borescope inspection for cylinder #2 and #7 cracking
• Both EGR coolers inspected (known failure point)
• Compound turbo function verified
• Free freight pallet delivery to all 50 states
• 15 day replacement warranty on internal defects
• Bulletproofing strategy consultation available
• Honest discussion of 6.7L Powerstroke upgrade alternative if appropriate for your situation