The 350 Small Block Chevy is a V8 engine that became the most common engine swap in American automotive history

The 350 cubic-inch small block Chevrolet engine, often called the 350 or "small block," is a V8 engine that Chevrolet produced from 1967 to 2002. It displaces 350 cubic inches (5.7 liters) and was originally designed as a mid-range option between Chevy's smaller 327 and larger 427 engines. The engine became so widespread that it appears in everything from original Chevrolet vehicles to hot rods, boats, and machines it was never intended to power.

What made the 350 so common was its combination of reasonable cost, decent power output, and mechanical simplicity. A stock 350 produced between 250 and 370 horsepower depending on the year and carburetor setup. The engine's basic design — cast iron block, overhead valve configuration, and straightforward fuel delivery — meant that parts were cheap, repair shops knew how to work on them, and owners could modify them without exotic tools or knowledge.

The 350 is not the most powerful engine Chevrolet ever made, nor the most efficient. It is the engine that became the default choice when someone needed a V8 that would run, could be fixed with a wrench and a Saturday afternoon, and would not cost a month's salary to buy used.

Key Takeaways

  • The 350 small block is a V8 engine that displaces 350 cubic inches and was produced by Chevrolet from 1967 to 2002 in various forms.
  • Stock versions produced between 250 and 370 horsepower depending on the year, carburetor type, and whether it was a high-performance variant.
  • The engine uses a cast iron block, overhead valves, and either a carburetor or fuel injection depending on the model year.
  • Millions of 350 engines were produced, making used examples inexpensive and parts widely available at any automotive supplier.
  • The 350 became the standard engine for hot rod swaps because it fits in engine bays designed for smaller engines and responds well to bolt-on modifications.

How the 350 small block is built and what makes it different from other V8s

The 350 uses eight cylinders arranged in a V shape, with four cylinders on each side of the engine block. Each cylinder has two valves — one to let the air-fuel mixture in and one to let the exhaust out. The valves are operated by pushrods connected to a camshaft that runs down the center of the engine, which is why this design is called "overhead valve" or OHV. This is different from overhead cam engines, where the camshaft sits on top of the cylinder head.

The engine block is cast iron, which is heavier than aluminum but cheaper to manufacture and more durable under high stress. The cylinder heads are also cast iron on most 350s, though some performance variants used aluminum heads. The crankshaft, which converts the up-and-down motion of the pistons into rotational motion, is a forged steel piece that runs through the center of the block.

The 350's displacement of 350 cubic inches comes from the bore (cylinder diameter) and stroke (how far the piston travels). Most 350s have a bore of 4.00 inches and a stroke of 3.48 inches. This ratio — slightly more bore than stroke — makes the 350 a "square" engine, which means it can rev higher than "long-stroke" engines and produces power across a wider RPM range.

Carburetor versus fuel-injected 350 engines and what that means for performance

Early 350 engines, from 1967 through the mid-1980s, used a carburetor to mix gasoline with air. A carburetor is a mechanical device with no computer control — it relies on vacuum, springs, and jets to deliver the right fuel mixture at different engine speeds. Carbureted 350s are simpler to understand and easier to modify with bolt-on parts, but they are sensitive to temperature, altitude, and fuel quality.

Starting in the mid-1980s, Chevrolet began equipping 350s with fuel injection, which uses an electric pump, fuel rails, and computer-controlled injectors to spray fuel directly into each cylinder. Fuel-injected 350s start more reliably in cold weather, run cleaner, and produce more consistent power. They are also harder to modify because changing intake manifolds or cam profiles requires reprogramming the engine computer.

A carbureted 350 from 1972 will produce less horsepower than a fuel-injected 350 from 1995, even if both are stock. The fuel-injected version benefits from better combustion control, tighter tolerances in manufacturing, and decades of refinement. However, a carbureted 350 is often the choice for hot rod builders because the modification path is clearer and the parts ecosystem is larger.

Why the 350 became the standard engine swap and what that means for availability

The 350 small block became the default engine swap because it was produced in enormous quantities — millions of units over 35 years — and because it fits in engine bays designed for six-cylinder engines. A 1968 Chevelle or Camaro originally equipped with a 327 could accept a 350 with minimal modification. The engine's compact footprint and straightforward mounting points made it a natural fit for hot rodders and restoration shops.

Used 350 engines are cheaper than almost any other V8 because supply is so high. A running 350 pulled from a 1990s truck can be found for $400 to $800 at a salvage yard. New reproduction 350 blocks and heads are manufactured by companies like Chevrolet Performance and Edelbrock, so you can also buy a complete new engine if you want a warranty and known history.

This abundance means that parts are stocked everywhere. Any auto parts store carries 350-specific gaskets, oil filters, spark plugs, and intake manifolds. Machine shops know how to rebuild 350s. This availability is why the 350 remains common in vehicles built today, even though Chevrolet stopped producing it for new cars in 2002.

Common modifications and what they do to power and reliability

A stock 350 can be modified in stages, each adding power and cost. The simplest modifications are bolt-on parts that require no machine work: a performance air intake, a less restrictive exhaust manifold, and a tuned carburetor or fuel injection tune. These changes typically add 20 to 40 horsepower and cost $300 to $800.

The next level involves internal changes that require removing the engine from the vehicle. A performance camshaft, higher-compression pistons, and ported cylinder heads can add 50 to 100 horsepower. These modifications cost $1,500 to $3,000 in parts and labor. A modified 350 with these upgrades can produce 400 to 450 horsepower.

More aggressive modifications — stroker kits that increase displacement to 383 or 406 cubic inches, nitrous oxide systems, or superchargers — can push a 350-based engine to 500+ horsepower. These modifications require supporting changes to the transmission, cooling system, and fuel system, and they reduce engine lifespan if the engine is driven hard regularly.

A stock 350 is reliable enough for daily driving and will run for 150,000 to 200,000 miles with normal maintenance. Modified 350s are less predictable — a lightly modified engine with quality parts can last just as long, but an aggressively modified engine driven hard will wear faster and may need rebuilding sooner.

What year 350 engine you have and why it matters for parts and performance

The 350 changed significantly over its 35-year production run. Early 350s (1967–1974) had cast iron heads, lower compression ratios, and produced 250 to 300 horsepower. Mid-range 350s (1975–1985) had emissions equipment that reduced power but improved reliability. Later 350s (1986–2002) had fuel injection, computer controls, and produced 230 to 370 horsepower depending on the process.

The year matters because parts are not always interchangeable. A 1970 350 cylinder head will not bolt onto a 1995 350 block without modification. Intake manifolds, exhaust manifolds, and water pumps changed over time. If you are buying a used 350 or planning a swap, knowing the exact year and original vehicle helps you source the right parts and avoid buying incompatible pieces.

High-performance variants like the 350 in the 1970 Chevelle SS or the LT1 350 in the 1992–1997 Corvette are worth more and produce more power than standard versions. These engines command higher prices at salvage yards and are more sought after by builders. A standard 350 from a 1990s truck is the cheapest option and is perfectly adequate for most projects.

Frequently Asked Questions

How much horsepower does a stock 350 small block produce?

A stock 350 produces between 250 and 370 horsepower depending on the year and original process. Engines from the 1970s produced less power due to emissions controls. Fuel-injected 350s from the 1990s produced more. The exact number is listed on the engine block or in the vehicle's original documentation.

Can you put a 350 in a car that did not come with one?

Yes, the 350 fits in many engine bays designed for six-cylinder or smaller V8 engines. Cars from the 1960s and 1970s are common swap candidates. You will need motor mounts, a new radiator, exhaust work, and possibly fuel system modifications. The electrical and cooling systems must be sized for the larger engine.

What is the difference between a 350 and a 327 Chevy engine?

The 327 displaces 327 cubic inches and was produced before the 350. The 327 has a longer stroke and shorter bore than the 350, which makes it produce peak power at lower RPMs. The 350 revs higher and produces power across a wider range. Both use the same basic design, and many parts interchange.

How long does a 350 engine last?

A stock 350 with regular oil changes and maintenance typically runs 150,000 to 200,000 miles before needing a rebuild. Some engines last longer if driven gently. Modified engines or those driven hard may need rebuilding sooner. Rebuilding a 350 costs $1,500 to $3,000 depending on what is worn.

Where can you buy a used 350 engine?

Used 350 engines are available at salvage yards, online marketplaces like eBay Motors, and specialty engine suppliers. Prices range from $400 to $1,200 depending on mileage and condition. New 350 blocks and complete engines are sold by Chevrolet Performance and aftermarket manufacturers, with prices starting around $2,500 for a basic block.