Ford Power Stroke Head Studs & Head Gaskets: Why They Blow, TTY Bolts vs ARP Studs & Fitment (6.0 / 7.3 / 6.4 / 6.7)

Head gaskets are the single most consequential repair on a Ford Power Stroke — especially the 6.0L — and the phrase most owners search first is “head studs,” because on these engines the gasket and the fastener are really one decision. This is the reference: why Power Stroke head gaskets let go, why torque-to-yield bolts are the root of it, when ARP head studs are the fix, the 18mm-vs-20mm 6.0 gasket difference, and what fits which engine. Buy new studs and gasket hardware on Amazon Automotive; ARP kits and OEM gasket sets also live on eBay Motors.

Not sure which engine you’re working on? Start with the Super Duty generations & fitment guide, then shop the head gaskets category.

Why Power Stroke Head Gaskets Blow

On the Power Stroke — and the 6.0L above all — a blown head gasket is a symptom of heat, and heat starts at the oil cooler. The chain is well understood:

1. The factory oil cooler clogs (casting sand and coolant deposits restrict its narrow passages), so coolant stops moving heat the way it should.
2. Starved of proper coolant flow, the EGR cooler cooks and combustion temperatures climb.
3. The engine’s torque-to-yield (TTY) head bolts — designed to stretch to a set tension once and never be reused — give up their clamping load under that sustained heat and boost.
4. With the bolts stretched, the heads lift microscopically under cylinder pressure and push combustion gas into the cooling system.

The result is the classic 6.0 head-gasket signature: coolant loss with no visible leak, white exhaust, bubbling in the coolant degas bottle, and overheating under load. Because the failure is a heat failure, fixing only the gasket without fixing the cooling — and the clamping — is how a truck ends up back on the lift. Fix the cooling and the clamping together. See the full weak-point order in the 6.0 problems guide.

TTY Head Bolts vs ARP Head Studs — the Core Decision

This is the buyer’s decision the whole topic revolves around:

• Torque-to-yield (TTY) bolts are the factory design. They’re torqued into their yield zone so they stretch to a precise tension — once. They clamp well when new, but they permanently deform, can’t hold up to repeated heat cycling and added boost, and are single-use. Reusing stretched TTY bolts is a common cause of a repeat failure.
• ARP head studs thread into the block and clamp the head with a nut torqued against a stud that stays in its elastic range — it doesn’t yield. That means more even clamping and, critically, clamping load that holds run after run. On a tuned engine making more than stock boost, that’s the difference between a sealed head and a lifted one.

The rule of thumb: if the heads are coming off for any reason on a 6.0L, install ARP head studs while you’re in there. On the 7.3L, keep the stock bolts unless you’re building for serious power. On the 6.4L and 6.7L, studs are a tuning upgrade — worthwhile once horsepower climbs.

Head studs require the cylinder heads to come off — there is no “install without pulling the heads.” Plan the job around that reality.

Head Studs & Gaskets by Engine

Head gasket and stud parts are engine-specific — bolt length, thread, torque spec, and gasket dimensions all differ. Use this as the map, then match the exact kit to your truck.

6.0L Power Stroke (2003–2007) — the one everyone means

The 6.0L is the head-gasket engine, and the reason ARP studs are practically a rite of passage on these trucks.

• The failure: stretched TTY bolts letting the heads lift once the oil cooler and EGR cooler stop controlling heat.
• The fix: ARP head studs installed with fresh OEM head gaskets when the heads are off — the permanent cure and the core of a “bulletproofed” 6.0.
• 18mm vs 20mm gaskets: 2003–early-2006 trucks used the 18mm head gasket; late-2006–2007 used the thicker, more durable 20mm gasket. Many rebuilds step an early engine up to the 20mm gasket for extra margin, which means matching the correct gasket, dowels, and head-machining spec — confirm what your heads and block are set up for rather than assuming by year alone.
• Do it once: with the turbo and intake off, renew the oil cooler and EGR cooler (the root cause), the turbocharger mounting gaskets, O-rings, and bolts, and the intercooler boots and clamps while access is open. If the oil-side standpipes and dummy plugs haven’t been done on a 2004.5-up truck, this is the moment. Shop the cooling side in the EGR & cooling category.

7.3L Power Stroke (1994.5–2003) — rarely needs studs

• Reality: the 7.3L is famous for not blowing head gaskets at stock power. Its head bolts hold fine for a stock or lightly-tuned truck.
• When studs matter: only on high-boost, high-horsepower builds where cylinder pressure exceeds what the stock bolts can clamp. If a stock 7.3 is losing coolant, diagnose the oil cooler, coolant, and degas system first — a head gasket is unlikely.
• While you’re servicing a 7.3 top end, the oil pressure sensor/switch is a cheap, common wear item worth renewing.

6.4L Power Stroke (2008–2010) — studs on tuned trucks

• The 6.4L can lift head gaskets under aggressive tuning, though it’s better known for cracked pistons at high power. ARP studs are a sensible upgrade on any 6.4 running a hot tune, installed with fresh OEM gaskets.
• The 6.4 uses a different ARP kit than the 6.0 — match the kit to the engine.

6.7L Power Stroke (2011+) — the strongest bottom end, studs for big power

• The 6.7L Scorpion is the most robust of the four and doesn’t have a stock head-gasket reputation. Head studs here are a high-horsepower upgrade — worthwhile once you’re pushing well past stock boost with a built truck.
• For most 6.7 owners the fuel system, not the head gaskets, is the priority; see the 6.7 CP4.2 failure guide.

What to Replace While the Heads Are Off

Head studs and gaskets are a labor-heavy job — the value is in doing everything the disassembly gives you access to once:

• Oil cooler + EGR cooler — the root cause on the 6.0; don’t reinstall the old ones. Shop the EGR & cooling category.
• Turbocharger mounting gaskets, O-rings, and bolts — the turbo mounting kit reseals the turbo you had to remove.
• Intercooler boots and clamps — the 6.0 intercooler boot kit restores boost sealing; a leak here mimics other problems. See the down-on-boost diagnosis guide.
• Standpipes and dummy plugs (6.0, 2004.5+) — the standpipe/dummy-plug kit fixes high-pressure oil leaks that cause hard starts.
• Fuel and oil filtration — start the rebuilt engine on a fresh FD-4616 6.0 fuel/oil filter and follow the maintenance schedule.

Buying Head Studs & Gaskets

• New ARP kits & gasket hardware — available new on Amazon Automotive and through the head gaskets category. Match the ARP kit to your exact engine (7.3 / 6.0 / 6.4 / 6.7) — they are not interchangeable — and follow ARP’s supplied torque spec and moly assembly lube, which is what makes the published torque produce the correct clamping load.
• ARP kits & OEM gasket sets on eBay Motors — the used/OEM/take-off marketplace is strong for ARP head stud kits and genuine OEM head gasket sets (including the 18mm and 20mm 6.0 gaskets). Use the eBay Motors buttons in the sidebar to find the right kit for your engine.

Bottom line: on the 6.0L, the head gasket and the head stud are one decision — fix the heat that caused the failure, clamp the heads with ARP studs and fresh gaskets sized to your engine, and refresh everything the teardown exposes. Do it once, do it right, and a “bulletproofed” 6.0 runs past 250,000 miles.