A 350 small block crate motor is a complete, ready-to-run engine built to Chevrolet specifications and sold as a single unit, not a vehicle.

The engine arrives at your shop or garage already assembled, tested, and capable of starting. You bolt it into an engine bay, connect fuel and ignition lines, and it runs. The price varies widely depending on what's included: a basic long-block (cylinder head, block, and internals, but no accessories) costs less than a turnkey version (complete with alternator, water pump, and starter). A 350 small block typically produces between 300 and 400 horsepower, depending on the builder and specification.

People buy crate motors for three main reasons: to replace a failed engine in an older vehicle without rebuilding the original, to swap into a classic car or hot rod, or to upgrade a vehicle that originally came with a smaller or weaker engine. The 350 is popular because it fits in many Chevrolet vehicles from the 1960s onward and because parts are cheap and widely available.

Key Takeaways

  • A 350 small block crate motor arrives fully assembled and tested, ready to bolt into an engine bay, but does not include installation labor or custom fabrication.
  • Prices range from roughly $3,000 to $8,000 depending on whether you buy a long-block, short-block, or fully dressed turnkey unit with all accessories included.
  • Installation requires mechanical skill or a professional shop, and you will need to source or adapt fuel system, cooling system, and electrical connections for your specific vehicle.
  • A 350 small block produces between 300 and 400 horsepower in most crate configurations, which is sufficient for street driving but not competitive in modern racing.

Long-Block vs. Short-Block vs. Turnkey: What's Included

A long-block includes the cylinder block, crankshaft, pistons, connecting rods, cylinder head, valves, and camshaft. It does not include the alternator, water pump, starter, fuel pump, ignition components, or intake manifold. You buy these separately and install them yourself or pay a shop to do it. Long-blocks are the cheapest option, typically $3,000 to $4,500.

A short-block is less common in the crate market but includes the block, crankshaft, pistons, and connecting rods—everything below the cylinder head. You still need to source and install the head, alternator, water pump, and all accessories. Short-blocks fall between long-blocks and turnkey units in price.

A turnkey or fully dressed motor arrives with the alternator, water pump, starter, fuel pump, intake manifold, and sometimes the carburetor or fuel injection system already bolted on. You can theoretically bolt it in and run it. Turnkey motors cost $5,500 to $8,000 or more, depending on the builder and horsepower rating. The trade-off is that you pay for parts you may not need or may want to replace with higher-quality versions.

Real Costs Beyond the Engine Price

The crate motor itself is only part of the bill. Installation labor at a professional shop typically runs $1,500 to $3,000 for a straightforward swap in a vehicle the engine was designed for. If you are swapping into a vehicle that did not originally have a 350 (for example, putting one in a Ford or Mopar), you need custom motor mounts, which add $500 to $1,500 in parts and labor.

Fuel system work is often overlooked. If the crate motor comes with a carburetor and your vehicle has an old fuel tank and lines, you may need to upgrade the fuel pump and filter to handle the engine's demands. Fuel injection swaps cost significantly more—$2,000 to $4,000 in parts and labor. Cooling system upgrades (radiator, hoses, thermostat housing) run $500 to $1,500 depending on what you already have.

Electrical work includes wiring the alternator, starter, and ignition system to your vehicle's harness. If the crate motor uses a different connector style than your vehicle, you may need a wiring harness adapter or custom work, adding $300 to $800. Exhaust fabrication (headers, pipes, muffler) typically costs $800 to $2,000 if you do not reuse your existing system.

Horsepower and Performance Ratings

A stock 350 small block produces roughly 300 to 350 horsepower in most crate configurations. Higher-output versions with better heads, a more aggressive camshaft, and tuned intake manifolds reach 375 to 400 horsepower. Some builders offer 425 to 450 horsepower versions, but these are less common in the crate market and cost significantly more.

Horsepower numbers vary by builder and test method. Some manufacturers rate power at the flywheel (brake horsepower), while others measure at the wheels (wheel horsepower), which is always lower because of drivetrain losses. Ask the seller which method they use before comparing prices across builders.

For street driving and light towing, 300 to 350 horsepower is adequate. For drag racing or high-performance driving, you will likely want a more specialized engine or significant modifications to the crate motor. A 350 small block is not competitive in modern racing without substantial investment in internals, fuel system, and tuning.

Popular Crate Motor Builders and Where to Buy

Chevrolet Performance (the official Chevrolet parts division) sells crate motors through authorized dealers. Their 350 options range from 290 to 370 horsepower depending on the model year and specification. Pricing is typically higher than aftermarket builders but includes a warranty and may provide compatibility with Chevrolet vehicles.

Aftermarket builders like BluePrint Engines, Edelbrock, and Jasper Engines offer 350 small blocks at various price points. BluePrint and Edelbrock tend to focus on street and mild performance applications, while Jasper specializes in remanufactured engines for fleet and commercial use. Each builder has different warranty terms—some offer one year, others three years or more.

You can also buy used or rebuilt 350 motors from salvage yards, engine rebuilders, or private sellers. Prices are lower (often $1,500 to $3,000), but there is no warranty, and you have no way to verify how many miles the engine has or how it was maintained. A used motor makes sense only if you have mechanical knowledge to inspect it or can have a shop do a pre-purchase inspection.

Installation: DIY vs. Professional Shop

If you have engine-building experience and a well-equipped garage, you can install a crate motor yourself. You will need an engine hoist, jack stands, basic hand tools, and several days of work. The hardest part is usually adapting the fuel system, cooling system, and electrical connections to your specific vehicle. Mistakes here can cause fires, overheating, or electrical failures.

Most people hire a professional shop. A shop that specializes in engine swaps can handle the custom work (motor mounts, fuel lines, wiring) that makes the difference between a running engine and a reliable one. Shops in rural areas may charge $50 to $75 per hour; shops in cities or specializing in high-end work may charge $100 to $150 per hour. Get a written estimate that breaks down labor by task (removal, installation, fuel system, cooling, electrical, exhaust) so you know where the money goes.

Warranty and Long-Term Reliability

Warranty terms vary by builder. Chevrolet Performance typically offers a one-year, unlimited-mileage warranty on new crate motors. BluePrint Engines offers a three-year, unlimited-mileage warranty on most models. Jasper Engines offers a three-year, 100,000-mile warranty. Aftermarket warranties usually exclude damage from improper installation, tuning, or abuse.

A crate motor is not necessarily more reliable than a well-maintained original engine. It is new, so it has no hidden wear, but it is also untested in your specific vehicle. Problems often emerge in the first few hundred miles as the engine settles in and you discover installation issues. Run the engine gently for the first 500 miles (no hard acceleration, no sustained high RPM) to let the rings seat and the bearings break in.

Long-term reliability depends on maintenance. Change the oil every 3,000 to 5,000 miles, keep the cooling system full, and do not ignore warning lights. A 350 small block can easily run 100,000 miles or more if treated well. Neglect it, and it will fail in 20,000 miles.

Frequently Asked Questions

Can I put a 350 small block in any vehicle?

No. A 350 fits easily in most Chevrolet vehicles from 1962 onward and in some other American trucks and cars. Putting one in a Ford, Mopar, or import requires custom motor mounts and often custom fuel and cooling system work. Check with a shop that does swaps before you buy the engine.

What is the difference between a 350 and a 383 or 427 crate motor?

A 350 has a 3.48-inch bore and 3.48-inch stroke. A 383 has a larger bore (4.03 inches) and produces more power—typically 400 to 430 horsepower. A 427 is even larger and produces 500+ horsepower. Larger engines cost more and may require additional cooling and fuel system upgrades. A 350 is the entry point; bigger engines are for people who need more power.

Do I need to tune or dyno a crate motor after installation?

If the crate motor comes with a carburetor, a basic carburetor tune (idle speed, air-fuel mixture) is usually needed after installation. If it comes with fuel injection, the shop may need to reprogram the computer to match your vehicle's wiring and fuel system. A dyno test is optional but useful for verifying horsepower and identifying tuning problems. Expect $300 to $600 for a basic tune or dyno session.

How long does installation take?

A straightforward swap in a vehicle the engine was designed for takes three to five days at a professional shop. Custom work (motor mounts, fuel system, wiring) can add another week. Ask the shop for a timeline before you drop the vehicle off.

Can I return a crate motor if it does not fit or does not run?

Return policies vary by seller. Chevrolet Performance and most reputable builders allow returns within 30 days if the motor is unused and in original packaging. Once installed, returns are usually not possible. Some builders will troubleshoot problems over the phone or via email. Read the return policy before you buy.