Engine lifters sit between the camshaft and the valves, and their exact location depends on what type of engine you have. In a traditional pushrod engine (also called overhead valve or OHV), the lifters are inside the engine block, riding directly on the camshaft lobes. In overhead cam engines (OHC), their equivalent components are up in the cylinder head. Either way, lifters serve the same purpose: they translate the spinning motion of the camshaft into the straight up-and-down motion that opens and closes your valves.
Lifters in Pushrod (OHV) Engines
If your vehicle has a pushrod engine, which is common in many V6 and V8 designs from domestic manufacturers, the lifters are mounted in vertical bores machined into the engine block or crankcase. The camshaft in these engines also sits low in the block, and each lifter rests directly on top of a cam lobe. As the camshaft spins, the lobe pushes the lifter upward. That motion travels through a pushrod, up to a rocker arm on top of the cylinder head, and finally pushes the valve open.
These lifters are free to rotate slightly in their bores, which helps distribute wear evenly across their bottom face. A solid (mechanical) lifter is essentially a hollow steel bucket with a hardened bottom that contacts the cam and a cup on top that cradles the pushrod. Hydraulic lifters are more complex internally. They contain a spring-loaded plunger that uses oil pressure from the engine’s lubrication system to automatically eliminate any gap (called “lash”) in the valve train. This self-adjusting feature is why hydraulic lifters run so quietly compared to solid ones, and it’s a big reason manufacturers adopted them for production engines.
Because the lifters are buried deep in the block, getting to them typically requires removing several layers of components. On a V-configuration engine, you’ll usually need to take off the valve covers, intake manifold, and sometimes the fuel rail and coolant pipes before you can pull the pushrods and access the lifter bores from above. It’s not a quick job.
Lifters in Overhead Cam (OHC) Engines
Overhead cam engines move the camshaft up into the cylinder head, directly above the valves. This changes where the lifter-type components live. Instead of sitting in the block, they’re housed in or on the cylinder head itself. In these engines, they’re often called lash adjusters or tappets rather than “lifters,” but they perform the same basic function.
There are three common arrangements in OHC engines. First, the lash adjuster can be built into the end of a rocker arm, where it presses against the valve stem tip. The cam pushes one end of the rocker arm, and the adjuster on the other end transfers that force to the valve. Second, in dual overhead cam (DOHC) setups with pivot-type rocker arms, a stationary lash adjuster mounts directly into the cylinder head and provides a ball pivot point for one end of the rocker arm. The cam pushes the rocker, and the adjuster keeps everything tight from its fixed position in the head.
The third design uses bucket tappets, which are cup-shaped components that fit over the top of each valve and spring. They sit between the cam lobe and the valve stem, so the cam pushes down on the bucket, which pushes directly on the valve. Some bucket tappets have a small hydraulic lash adjuster built inside them. These are compact, typically 12 to 16 mm in outer diameter, and are accessed by removing the camshafts from the cylinder head.
Flat Tappet vs. Roller Lifters
Regardless of where they’re located, lifters come in two main styles based on how they contact the camshaft. Flat tappet lifters have a smooth, slightly convex bottom surface that slides against the cam lobe. The contact face is made from hardened materials, often a steel alloy or stellite (an extremely hard cobalt-based alloy), friction-welded to a cast iron body. This hardening is critical because the lifter face and cam lobe are in constant sliding contact, generating significant friction and heat.
Roller lifters replace that flat face with a small steel wheel mounted on needle bearings. The roller contacts the cam lobe and rolls across it rather than sliding, which dramatically reduces friction and virtually eliminates cam lobe wear. Roller lifters can be either hydraulic or solid, just like flat tappets. They’ve become the standard in modern engines because they allow more aggressive cam profiles while lasting longer.
How Oil Reaches the Lifters
Lifters depend on a steady supply of pressurized engine oil, especially hydraulic designs. In pushrod engines, oil is forced under pressure through galleries in the block directly into the lifter bores. The oil fills the internal chamber of each hydraulic lifter, keeping the plunger pressurized so it can maintain zero lash. From there, the oil actually travels up through the hollow pushrods to lubricate the rocker arms at the top of the engine, making the lifter a key distribution point in the oiling system.
In overhead cam engines, oil is pumped up to the cylinder head and spills onto the contact points between the cams, lash adjusters, and valve stems. The lash adjusters receive pressurized oil through small feed holes in the head to keep their internal hydraulic mechanisms charged.
Signs of a Failing Lifter
A rhythmic ticking or tapping from the upper half of the engine is the classic symptom. This sound speeds up with engine RPM and is often most obvious at cold startup or idle. In many cases, the noise fades as the engine warms up and oil pressure stabilizes, which points to a lifter that’s slow to pump up with oil. If the ticking is constant regardless of temperature, that’s a worse sign.
Beyond noise, a lifter that sticks or partially collapses prevents its valve from opening or closing properly. This restricts airflow into or out of the cylinder, which can cause rough idle, vibrations you feel through the steering wheel, sluggish acceleration, and reduced power. If the problem is severe enough to cause misfires, your check engine light will come on and the engine computer will store misfire codes.
A fully collapsed lifter is the most serious scenario. It means the lifter has completely lost its ability to maintain hydraulic pressure, so the valve isn’t operating correctly at all. The result is a loud, consistent metallic clatter rather than a light tick, along with immediate performance problems. Left unaddressed, a collapsed lifter can accelerate wear on the cam lobe it rides on, potentially turning a single failed lifter into a camshaft replacement as well.
Why Lifter Location Matters for Repairs
Knowing where your lifters are tells you a lot about what’s involved in replacing them. In a pushrod V8, the lifters are deep in the block valley, hidden under the intake manifold and valve train components. Replacing them can mean several hours of labor just to gain access. In an inline pushrod engine, the process is somewhat simpler since there’s only one bank of cylinders to deal with, but you still need to pull the valve cover, pushrods, and sometimes more.
In overhead cam engines, the lifters or lash adjusters are in the cylinder head, which means removing the cam cover and usually the camshafts themselves. This is mechanically straightforward on some engines and quite involved on others, especially DOHC designs with variable valve timing hardware bolted to the camshaft ends. Either way, the repair requires careful attention to torque specs and timing marks when everything goes back together.