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Call or Text (352) 722-5295Short and long blocks on the 2003-2007 Ford 6.0L Powerstroke
The 6.0L is a cast-iron 90-degree V8 with cast-iron heads, a bedplate main cap design and a gear-driven cam in the block. It is sold as a 6.0 liter but actually displaces 5.95 L, or 363 cubic inches, from a 95 mm bore and 105 mm stroke, with 18.0:1 compression and four valves per cylinder. The complete engine weighs about 966 lb with oil. The long block is strong: the bedplate prevents main cap walk, and the stock heads and rods support about 700 rwhp.
What fails and why
The 6.0L's weak point is the head gasket joint, not the bottom end. Each cylinder has only four 14 mm torque-to-yield head bolts, with the inner bolts shared between neighbors. A failed EGR cooler, heavy towing or added power raises cylinder pressure, the bolts stretch, and the gasket lifts. Cylinder head cracking is reported alongside those failures, usually after repeated overheating. The clues are persistent coolant loss after a gasket job, coolant in a cylinder, or a misfire.
Stock replacement vs. upgrade
When a head is cracked, it gets replaced. Fleece's Freedom Series HD heads are built as a heavy-duty replacement for the factory 6.0L casting. Whichever head you run, bolt it down with head studs instead of new torque-to-yield bolts; studs are the standard fix for this engine's head gasket problem and are highly recommended before you add power. O-ringed heads are recommended only above roughly 700 rwhp or for high-boost builds, so most trucks do not need them. If an EGR cooler failure started the chain, replace the oil cooler on the same job; a restricted oil cooler can kill a new EGR cooler within 30,000 to 50,000 miles.
What we carry
Right now this section holds Fleece Performance Engineering Freedom Series HD cylinder heads for the 2003-2007 6.0L, listed in an 18 mm dowel version and a 20 mm dowel version. Head studs, main studs, head gasket kits and stepped dowel pins for the same job are in the Heads & Studs section of this engine, and Mahle head gasket and engine gasket sets are in the Valve Cover section.
Fitment notes
A replacement long block has to match your engine's build family. Injectors from engines built before 9/22/2003 do not interchange with later ones, the 2004 and 2005 HPOP and oil rail designs differ, and 2003 engines use a different piston bowl and longer glow plugs than 2004 and later engines. The Fleece heads are listed by dowel size, so confirm which dowel your engine uses before you order. Early 2003 Super Dutys were still 7.3L trucks, and E-Series vans and 2005 Excursions can carry earlier-spec engines, so identify by engine build date, not model year. Verify by VIN, or call the shop. All our Ford diesel parts are on the Powerstroke page.
Frequently asked questions
How strong is the stock 6.0L bottom end?
Strong. The bedplate main cap design prevents main cap walk, and the stock heads and rods support about 700 rwhp. The weak link is the head fasteners, which is why head studs are highly recommended before you add power.
Will a long block from a 2005 6.0L fit my 2004?
Not without careful matching. Replacement long blocks must match the build family: injector generation, the 2004 versus 2005 HPOP and oil rails, and the 2003 versus 2004 and later glow plug length and piston bowl. Match by engine build date, and call us with your VIN if you are unsure.
Which Fleece head do I need, 18 mm or 20 mm dowel?
The one that matches the dowel size in your engine. Fleece lists the Freedom Series HD head in both versions, and the head gasket kits in our Heads & Studs section are split the same way. Confirm the dowel size before you order; give us your VIN and we can help.
What does a 6.0L Powerstroke actually displace?
It is sold as a 6.0L but displaces 5.95 L, or 363 cubic inches, from a 95 mm bore and 105 mm stroke. The assembled engine weighs about 966 lb with oil, so plan your lifting equipment around that.
Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.