The 572 is a large-displacement big block engine built from the 454 platform

The 572 big block Chevy is a 572-cubic-inch engine that Chevrolet and aftermarket builders create by boring and stroking the 454 block. It is not a factory production engine — General Motors never offered it in a car or truck from the assembly line. Instead, the 572 exists in the aftermarket as a performance upgrade, typically built by engine shops or purchased as a crate engine from specialty suppliers.

The 572 sits at the upper end of big block displacement. It produces between 500 and 750 horsepower depending on how it is assembled, what fuel it runs, and whether it is naturally aspirated or supercharged. Builders use it in hot rods, drag racing vehicles, and high-performance restorations where the goal is maximum power in a classic or vintage platform.

Understanding what a 572 is — and what it is not — matters if you are considering one for a project or trying to understand what you are looking at in an engine bay. The engine has real capabilities and real limitations, and both depend on how it was built and what it is installed into.

Key Takeaways

  • The 572 is an aftermarket big block built by boring and stroking the 454 block to 572 cubic inches, not a factory Chevrolet engine.
  • Horsepower ranges from 500 to 750 depending on the builder, fuel type, and whether forced induction is used.
  • A 572 requires a compatible transmission, fuel system, cooling system, and electrical setup — you cannot straightforward drop it into any vehicle.
  • The engine is heavier than modern small blocks and produces significant heat, so frame, suspension, and radiator capacity must be planned before installation.
  • Crate 572 engines from established builders cost between $8,000 and $15,000 before installation labor and supporting modifications.

How the 572 is built and what displacement means

Displacement is the total volume of air and fuel that an engine's pistons move through all cylinders in one complete cycle. The 454 big block Chevy displaces 454 cubic inches. To reach 572 cubic inches, builders increase bore (the width of the cylinder) and stroke (the distance the piston travels), or both.

Most 572 builds use a 454 block with a larger bore and a longer crankshaft. The block itself must be line-bored and honed to accept the larger pistons. Custom or forged pistons and connecting rods rated for the higher pressures are installed. A longer stroke requires a custom crankshaft, which is one of the most expensive parts of the build.

The result is an engine that displaces more fuel and air per revolution, which means more power per cycle — but only if the fuel, ignition timing, and air intake are tuned to match. A 572 that is poorly matched to its fuel system or carburetor will not produce its rated power and may run rough or damage itself.

Horsepower, torque, and what affects real-world performance

A stock 572 crate engine typically produces 500 to 550 horsepower naturally aspirated. Builders who add a supercharger or nitrous oxide system can push output to 650 to 750 horsepower, but those additions require stronger internal parts, a more robust fuel system, and a transmission rated for the extra load.

Torque — the twisting force the engine produces — is where the 572 excels. Big block engines produce torque across a wide RPM range, which means the engine pulls hard from low speeds. A 572 typically produces 600 to 700 foot-pounds of torque, depending on the build. That torque is useful in a drag racing car or a heavy hot rod, but it also means the engine will strain a weak transmission or suspension.

Real-world performance depends on what the engine is installed into. A 572 in a lightweight drag racing frame will feel dramatically faster than the same engine in a 4,000-pound street rod. Fuel quality matters too — a 572 built for 110-octane racing fuel will not run correctly on 93-octane pump gas, and attempting to do so can cause detonation and engine damage.

Installation requirements and what you cannot ignore

Installing a 572 is not a bolt-in job. The engine is physically large and heavy — roughly 650 to 700 pounds depending on accessories. The frame or chassis must be reinforced to handle the weight and the torque loads. Engine mounts must be rated for the displacement and power output, or they will fail and the engine will shift under acceleration.

The transmission behind the 572 must be selected carefully. A Turbo 400 automatic is common in hot rods and drag cars because it is strong and compact. A manual transmission must be a heavy-duty unit like a Muncie M22 or a modern aftermarket box. A stock transmission from a 1970s Chevrolet will not survive the power for long.

The cooling system must be oversized. A 572 produces significant heat, and a standard radiator will not keep it cool under load. Most 572 installations use a large aluminum radiator, an electric fan, and sometimes a transmission cooler. Without adequate cooling, the engine will overheat and lose power or suffer damage.

The fuel system must supply enough volume and pressure. A mechanical fuel pump is not adequate — a 572 needs an electric pump rated for at least 100 gallons per hour at the carburetor or fuel injection system's required pressure. The fuel lines must be sized correctly, and the tank must be large enough to prevent vapor lock during sustained high-RPM running.

Electrical system and ignition considerations

A 572 requires a robust electrical system. The starter must be rated for the engine's displacement and compression ratio — a weak starter will not crank a high-compression big block reliably. The alternator must produce enough amperage to charge the battery and power accessories while the engine is running at high RPM.

Ignition timing and spark plug selection are critical. A 572 built for racing fuel may require a high-output ignition system and spark plugs gapped tighter than a stock engine. If the ignition timing is set incorrectly, the engine will detonate, which damages pistons and can destroy the engine in seconds. Many 572 builders use a programmable ignition box that adjusts timing based on RPM and load.

The battery must have enough cold-cranking amps to turn over a high-compression engine in cold weather. A standard automotive battery is often insufficient, and many 572 installations use a battery rated for 800 to 1,000 cold-cranking amps.

Cost and where to source a 572

A complete crate 572 engine from an established builder like Chevrolet Performance, Blueprint Engines, or Edelbrock typically costs between $8,000 and $15,000. The price depends on the specific build — naturally aspirated engines are less expensive than supercharged versions, and engines with premium internal parts cost more than basic builds.

Installation labor is separate and varies widely. A shop that specializes in big block installations may charge $3,000 to $8,000 for labor, depending on the vehicle and the complexity of the installation. If the vehicle requires frame modifications, suspension upgrades, or a new fuel system, costs rise significantly.

Used 572 engines are available but carry risk. A used engine may have unknown history, hidden damage, or wear that is not visible without a teardown. Buying a used 572 requires either a pre-purchase inspection by a may have access to engine builder or a willingness to accept the possibility of expensive repairs after installation.

Common mistakes and what goes wrong

The most common mistake is underestimating the supporting systems. A builder will buy a 572 crate engine and attempt to install it into a car with the original radiator, fuel system, and transmission. The engine runs hot, the transmission fails, or the fuel system cannot keep up with demand. These failures are expensive and could have been prevented with proper planning.

Another frequent error is mismatching fuel and ignition. A 572 built for 110-octane racing fuel installed in a street car and run on 93-octane pump gas will detonate and damage itself. The builder must know what fuel the engine was designed for and either use that fuel or have the engine re-tuned for pump gas.

Inadequate cooling is a third major problem. A 572 that overheats loses power, and repeated overheating causes internal damage. Many first-time 572 builders discover too late that their cooling system is undersized and must be replaced.

Frequently Asked Questions

Can I put a 572 in my 1970 Chevrolet pickup?

Physically, yes — the 572 will fit in the engine bay of most full-size Chevrolets. Practically, you will need to reinforce the frame, upgrade the suspension, install a heavy-duty transmission, and build a new fuel and cooling system. The truck will also be nose-heavy and may handle poorly. Plan on $15,000 to $25,000 in total cost beyond the engine itself.

How much fuel does a 572 use?

A 572 in a street car driven at highway speeds may get 8 to 12 miles per gallon. In a drag racing car or under hard acceleration, fuel consumption is much higher. A 572 is not an engine for fuel economy — it is built for power, and fuel consumption is a consequence of that design.

What is the difference between a 572 and a 454?

The 454 is the factory big block Chevrolet engine that displaces 454 cubic inches. The 572 is an aftermarket enlargement of the 454 block that adds displacement by boring and stroking. A 572 produces more power and torque than a stock 454, but it also requires more fuel, produces more heat, and puts more stress on the transmission and chassis.

Do I need a special carburetor for a 572?

Yes. A 572 needs a carburetor sized for its displacement and power output — typically a 750 to 850 CFM four-barrel. A carburetor that is too small will starve the engine of fuel and limit power. A carburetor that is too large will run poorly at low RPM. The builder should specify the correct carburetor size when you order the engine.

Can I use a 572 in a street car?

Yes, but it requires careful tuning and the right supporting systems. A 572 in a street car will be loud, produce a lot of heat, and consume fuel quickly. It will also attract attention and may draw law enforcement scrutiny if the car is modified for racing. Many street 572 builds are done in classic cars or hot rods where the appearance and sound are part of the appeal.