The Chevy 496 CI Big Block Engine is a powerhouse based on the Chevrolet 454 big block, modified to achieve a displacement of 496 cubic inches.

This engine is prized for its exceptional torque and horsepower, making it ideal for high-performance and heavy-duty applications. Known for its “big block” design, the 496 combines large displacement with durable construction, allowing it to produce impressive power levels that are ideal for muscle cars, trucks, off-road vehicles, and drag racing.

Key Specifications and Modifications

1. Stroker Crankshaft and Increased Displacement

• The 496 is created by increasing the bore of a 454 big block to 4.310 inches and using a longer stroke crankshaft, extending the stroke from 4.00 inches to 4.25 inches. This larger bore and stroke combination results in the 496 cubic-inch displacement.
• With this setup, the engine offers significantly more torque than a 454 and can comfortably produce over 600 horsepower with the right components.

2. Cylinder Heads

• The 496’s performance can be heavily influenced by the choice of cylinder heads. Most builders choose aluminum heads for weight savings and improved cooling, though cast iron heads are also common for durability. Heads with large ports and high-flow valves (like 2.25” intake and 1.88” exhaust) help maximize airflow and power output.
• Heads with 110cc to 120cc combustion chambers are common, allowing for a balanced compression ratio suitable for both street and performance use.

3. High-Performance Camshaft

• Camshaft selection is key to defining the engine’s power band. A hydraulic roller camshaft is popular for high-performance 496 builds, offering reliability and less friction compared to flat-tappet cams.
• For aggressive builds, a camshaft with around 0.600″ lift and 240°-250° duration helps maximize the engine’s ability to make power at higher RPMs.

4. Fuel System and Carburetion

• High-performance carburetors in the range of 850-950 CFM are common for a 496. Many builds, however, also incorporate electronic fuel injection (EFI) systems, especially in restomods or builds intended for reliable street driving.
• EFI setups can provide better fuel efficiency, throttle response, and tunability compared to carburetors, making them ideal for modern builds.

5. Forged Internals

• Due to the high stress on internal components, most 496 builds use forged pistons, rods, and a forged crankshaft. These components are better able to handle the high torque and horsepower generated by the engine, particularly under high-load or high-RPM conditions.

If you are interested in buying this engine you can find our deal at the bottom of this page

Typical Applications for the Chevy 496 Big Block Engine

• Muscle Cars: Classic muscle cars like the Chevy Chevelle, Camaro, and El Camino often utilize a 496 to achieve substantial horsepower and torque, bringing modern power levels to vintage builds.
• Heavy-Duty Trucks: The high torque output makes the 496 perfect for trucks used in towing or heavy-duty applications, where low-end power is essential.
• Off-Road Vehicles: For off-road or rock-crawling applications, the 496 provides the low-end grunt necessary to tackle difficult terrains.
• Drag Racing: With proper tuning and components, the 496 can produce well over 700 horsepower, making it a great choice for drag racing where torque and acceleration are key.

you should read about the Chevy 383 Stroker Crate Engine

Sample Performance Table for Chevy 496 Big Block Configurations

Configuration	Horsepower (HP)	Torque (lb-ft)	Peak RPM	Compression Ratio
Street Performance	~550 HP	~600 lb-ft	5,500 RPM	9.5:1
Heavy-Duty/Torque	~500 HP	~650 lb-ft	4,800 RPM	8.5:1
EFI High Output	~600 HP	~650 lb-ft	6,000 RPM	10.0:1
Race-Optimized	~700 HP	~700 lb-ft	6,500 RPM	11.0:1

Benefits of the Chevy 496 Big Block Engine

• Massive Torque Output: The increased stroke length and large bore result in significant torque gains, especially at low to mid-range RPMs. This is essential for applications needing high pulling power or rapid acceleration.
• Durable Design: The 496 benefits from the big block’s robust design, making it capable of handling high levels of stress without compromising durability.
• High Power Potential: With the right setup, the 496 can achieve impressive horsepower figures, even rivaling big block engines with larger displacements.
• Extensive Aftermarket Options: The 496 has strong aftermarket support, with many performance parts available for customization, including heads, camshafts, pistons, and intake manifolds.

Limitations and Considerations

• Weight: The big block design means the 496 is heavier than small block engines, which can affect handling in lighter vehicles.
• Fuel Consumption: The 496 is a large, high-power engine that can consume significant amounts of fuel, making it less suitable for daily driving unless fuel efficiency is secondary.
• Cooling Requirements: High-performance 496 builds can run hot, especially under high loads, so an upgraded cooling system (larger radiator, electric fans) is recommended.
• Installation Complexity: The larger dimensions of a big block engine may require modifications to the engine bay in some vehicles, particularly smaller muscle cars and trucks.

If you want to get this engine for the best price you can check it here !