What to Look For in 6.7 Power Stroke Pushrods
TL;DR: The 6.7 Power Stroke is an overhead-valve diesel V8, so every valve event travels through a pushrod. Choosing a set comes down to four things: correct length and diameter for your engine, construction suited to the cylinder pressure and spring load you actually run, tip design and hardness, and consistency across the set. Stock-specification replacements are the right answer for a stock or lightly tuned truck; heavier-wall or chromoly pieces earn their keep only once boost, fuelling and spring pressure have gone up. Confirm the current part number against the manufacturer catalogue for your model year before ordering.
How the 6.7 Power Stroke valvetrain is put together
The 6.7 Power Stroke is a pushrod, overhead-valve V8 with four valves per cylinder — not an overhead-cam engine. One camshaft sits in the block, hydraulic lifters ride the lobes, and each pushrod carries that motion up to a rocker arm. Because there are two intake and two exhaust valves per cylinder, the rocker acts on a valve bridge — also called a yoke or crosshead — that spreads the load across a pair of valves.
That layout matters in two ways when you are shopping.
First, a diesel loads a pushrod far harder than a gasoline V8 of similar displacement. Cylinder pressures are higher, valve springs are stiffer, and on the exhaust side the valve has to open against meaningful backpressure. A pushrod is a slender compression member, and its failure mode under excess load is a bend, not gradual wear.
Second, the pushrod is only one link in a chain. If a pushrod is bent, the useful question is what bent it. A collapsed or failed lifter, a seized rocker, a cocked valve bridge, valve float from an over-rev, or valve-to-piston contact will each show up first as a bent pushrod. Replacing the tube alone and buttoning the covers back up usually buys a few thousand miles.
Before you order, it is worth browsing the pushrods collection alongside the 6.7 Powerstroke parts listings so you can see what else on the valvetrain is available for the same job.
The four things that actually differentiate a pushrod
1. Length and diameter — take these from the catalogue, not from a forum
Length is not a preference, it is a fitment dimension. It sets rocker geometry and, on a hydraulic-lifter engine, it sets how far the lifter plunger is preloaded into its bore. Too short and the lifter runs at the top of its travel with inadequate preload; too long and the plunger is held down, which can keep a valve from seating fully.
Diameter and wall thickness together set stiffness. A larger-diameter, thicker-wall tube resists buckling better, but it also has to clear the cylinder head passages and the valve bridge area. Do not assume an oversize tube drops in.
The practical rule: confirm both the length and the diameter for your specific engine and model year against the manufacturer's catalogue listing, and confirm the part number has not been superseded. Ford revised details across the 6.7's production run, and the correct piece for an early truck is not automatically the correct piece for a later one.
2. Material and heat treatment
Most replacement pushrods fall into one of two camps: heat-treated carbon steel, which is what the majority of stock-replacement pieces use, and chromoly alloy — commonly 4130 or 4140 — used for heavy-duty and performance sets. Chromoly gives more strength for the same wall thickness, which is why performance sets can hold their diameter while going up in capability.
Material alone is not the whole story. Heat treatment and the finish on the ends determine how a pushrod survives in service far more than the alloy name on the box, and a well-made carbon steel piece will outlast a poorly finished chromoly one.
3. Construction: one-piece versus two-piece
| Construction | How it is made | Where it fits | Watch for |
|---|---|---|---|
| One-piece | Tube and ends formed from a single piece, ends swaged or forged | Most stock-replacement applications | Nothing to separate under load; tip hardness varies by manufacturer |
| Two-piece | Separate hardened ends pressed or welded into a tube | Common on heavy-duty and performance sets | The quality of that joint is the whole question; cheap sets can separate |
| Oil-through | Drilled or open ends that feed oil upward | Application-specific — confirm before ordering | Fitting a solid pushrod where oil-through is required starves the rocker |
That last row catches people out. Whether your engine feeds the rocker through the pushrod or by another path is an application detail, not a preference — confirm it against the service information for your engine before you order, because getting it backwards causes a failure that looks like a lubrication problem rather than a parts problem.
4. Tip design and hardness
The ends do the surviving. On a diesel valvetrain, the pushrod tip and its mating cup or socket are a high-load sliding contact running on a thin oil film. Look for hardened, precision-ground tips and a consistent radius across the set. A dull, discoloured or galled tip has been running hot and dry, and it will chew up whatever it touches next.
Some heavy-duty sets use a larger ball radius to spread load. That is a real advantage under high spring pressure, but only if it matches the socket in the rocker and the seat in the lifter — mixed geometry concentrates load rather than spreading it.
When a stock replacement is enough — and when it is not
Buy stock-specification replacements when the truck runs the factory calibration, the springs are stock, and the damage traces to a single upstream failure you have found and corrected. There is no advantage in fitting heavier pushrods to an engine that never loaded the originals past their design point, and going heavier without a reason adds reciprocating mass in the wrong place.
Step up to heavier-wall or chromoly sets when the operating conditions have genuinely changed: more fuel and more boost than stock, higher spring pressures, sustained work at high load such as towing heavy, or a history of bending pushrods you cannot pin on a single component failure. In that last case, treat the bend as evidence that the valvetrain as a system is being loaded past its limit, and look at spring pressure and rev limits at the same time.
If you are replacing pushrods because a lifter came apart, budget for the rest of the job. Debris from a failed lifter roller circulates. Cut the oil filter open and inspect it, and plan on inspecting the lifters and rocker arms rather than assuming only the obvious cylinder is affected.
Inspecting the set you take out — and the set you put in
Before anything goes back in, do these checks. They cost minutes and they catch the majority of avoidable comebacks.
- Roll each pushrod on a flat surface. A machinist's plate or a clean piece of glass works. A bend that is invisible in your hand is obvious as a wobble on glass.
- Compare lengths across the set. You are looking for consistency, not an absolute number. One tube shorter than its neighbours has been compressed and is scrap regardless of how straight it looks.
- Inspect both tips under good light. Bright, evenly worn contact is normal. Discolouration, pitting, flat spots or a rough surface mean the part ran without adequate oil.
- Check the mating parts. Look into the rocker sockets and the lifter seats. A galled socket will ruin a new pushrod quickly.
- Confirm the valve bridges sit square. A cocked bridge loads the rocker and pushrod off-axis and is a common cause of repeat bends.
- Assemble and torque in the factory sequence. Torque the rocker and related fasteners in the sequence and to the values given in the service manual for your engine — do not carry figures over from another engine family or another model year.
A dial indicator, a straightedge, a good torque wrench and a set of clean picks cover nearly all of this; the engine stands and tools collection carries the measuring and assembly gear for the job.
Frequently Asked Questions
Does the 6.7 Power Stroke use pushrods? Yes. It is an overhead-valve V8 with a camshaft in the block, hydraulic lifters and pushrods operating rocker arms. It has four valves per cylinder, so each rocker acts on a valve bridge that opens a pair of valves. It is not an overhead-cam engine, and as a diesel it has no spark plugs, coils or knock sensors.
Can I replace just the one bent pushrod? You can, but do not stop there. A bent pushrod is a symptom. Find and fix what bent it — most often a lifter, a rocker, a cocked valve bridge or valve float — or the replacement will bend too. If the rest of the set is straight, consistent in length and clean on the tips, reusing it is reasonable.
Are chromoly pushrods worth it on a stock truck? Generally no. If the calibration, springs and boost are stock, the original specification is well matched to the rest of the valvetrain. Chromoly earns its place once spring pressure, cylinder pressure or rev limits have gone up beyond stock. Related hardware sits in the valves and valvetrain and diesel engine parts collections.
How do I know what length pushrod to order? From the manufacturer catalogue entry for your engine and model year, not from a general figure. Length sets rocker geometry and hydraulic lifter preload, and details changed across the 6.7's production run. Confirm the current part number before ordering, since numbers do get superseded.
What torque do the rocker fasteners take? Use the sequence and values published in the service manual for your specific engine and model year. Diesel valvetrain fasteners frequently use a torque-plus-angle procedure, and figures from another engine family do not transfer. Do not guess this one.
Should I replace the valve bridges at the same time? Inspect them all, and replace any showing uneven wear, a worn rocker contact pad or damage where they meet the valve stems. A worn bridge loads the pushrod off-axis, which is exactly the condition you are trying to eliminate.
Sources
- Ford factory service information for the 6.7L Power Stroke, for valvetrain layout, assembly sequence and published torque procedures. Use the volume matching your model year.
- Pushrod manufacturer catalogue and technical literature for material grades, construction types, tip geometry and application fitment data.
- Core Powertrain Parts technical team shop experience with overhead-valve diesel valvetrain diagnosis and inspection procedure.
Questions on fitment for your model year? Email sales@coretransmissionparts.com with your engine, model year and what you found on inspection. Orders over $70 ship free.