A 350 small block engine is a V8 that Chevrolet produced from 1967 through the early 2000s, and used versions appear regularly in classified ads, salvage yards, and specialty engine shops

The 350 is one of the most common V8 engines in the used market because Chevrolet installed it in trucks, cars, and performance vehicles for decades. That abundance means lower prices than rarer engines, but it also means you need to know what condition you are actually buying. A running 350 from a wrecked truck costs far less than a rebuilt one with a warranty, and the difference matters when you are deciding whether to buy from a private seller, a salvage yard, or a machine shop.

Before you contact a seller or visit a yard, you should understand what year and version you need, what "rebuilt" actually means in the engine world, and what questions separate a solid engine from one that will fail in your driveway.

Key Takeaways

  • A 350 small block engine varies in horsepower and design depending on the year it was made, so you need to match the year and process to your vehicle or project.
  • Used 350 engines fall into three categories: running used (pulled from a wrecked or junked vehicle), rebuilt (disassembled, inspected, and reassembled by a shop), and crate engines (new or fully restored with a warranty).
  • A running used engine is cheapest but comes with no may provide, while a rebuilt engine costs more but usually includes a limited warranty covering internal parts.
  • Before buying, you should verify the engine number, ask about compression and oil pressure, and understand whether the seller will stand behind the engine if it fails within the first few weeks.
  • Shipping a 350 engine costs between several hundred and over a thousand dollars depending on distance, so factor that into your total cost when comparing online listings.

The difference between running used, rebuilt, and crate engines

A running used engine is one pulled from a wrecked, totaled, or junked vehicle. The seller has usually started it or run it briefly to confirm it turns over. You are buying it as-is, with no warranty. The price is the lowest of the three categories because you are taking all the risk. If the engine runs for a week and then seizes, you have no recourse unless the seller made a false claim about its condition.

A rebuilt engine has been disassembled by a machine shop, inspected for wear, and reassembled with new gaskets, seals, and often new or restored internal parts like pistons, rings, and bearings. The shop tests it on a stand before shipping. Most rebuilt engines come with a limited warranty—typically 12 months or 12,000 miles—that covers internal failure but not installation labor or external parts. The price is higher than running used but lower than a crate engine.

A crate engine is either brand new from the manufacturer or fully restored to like-new condition by a specialty shop. Chevrolet Performance and other vendors sell crate 350s with full warranties. These engines cost the most but arrive ready to install with the highest confidence in longevity. Some come with a fuel injection system or other upgrades already installed.

How to identify which 350 you need

Chevrolet made 350 engines with different specifications across 35 years. The year, horsepower rating, and intended process all affect whether an engine will fit your vehicle and perform the way you want. The engine block itself is stamped with a casting number and date code that tell you when and where it was made.

If you are replacing an engine in an existing vehicle, the easiest path is to match the year and process of the original. A 1985 Chevrolet truck 350 will bolt into another 1985 Chevrolet truck more easily than a 1995 Corvette 350, because the accessories, mounts, and wiring harness are designed for that year and model. If you are building a custom engine for a hot rod or swap, you have more flexibility, but you will need to verify that the block, heads, and accessories you choose work together.

Before you buy, look up the casting number on the engine block using a Chevrolet engine identification guide. This tells you the year range and original process. Cross-reference that with your vehicle's manual or a Chevrolet forum to confirm compatibility. If the seller cannot provide the casting number or refuses to let you inspect the block, that is a red flag.

What to ask a seller before you commit

A seller who knows their engine can answer these questions without hesitation. If they cannot or seem evasive, move on to another listing.

Compression and oil pressure: Ask whether the engine has been compression tested and what the results were. Healthy 350 cylinders typically show 150 to 160 psi per cylinder, with no more than 10 psi variation between cylinders. Oil pressure at idle should be at least 20 psi; at 2,000 rpm, it should be 40 to 60 psi. If the seller has not tested these, ask whether they will before you pay.

Casting numbers and date codes: Request the casting number from the block and the date code stamped into it. This confirms the engine's age and original process. A seller who has this information written down is more trustworthy than one who has to guess.

Warranty and return policy: For a rebuilt engine, ask what the warranty covers, how long it lasts, and whether the seller will accept a return if the engine fails during the warranty period. Get this in writing. For a running used engine, ask whether the seller will refund your money if the engine does not start or run within the first week.

Reason for sale: Ask why the engine is being sold. If it was pulled from a wrecked vehicle, ask what part of the vehicle was damaged. If the damage was to the frame or suspension, the engine may be fine. If the damage was to the engine bay or the vehicle was flooded, the engine may have hidden problems.

Shipping costs and logistics

If you are buying from a seller more than a few hours away, you will need to arrange shipping. Engine shipping is not cheap because a 350 small block weighs 575 to 650 pounds depending on the accessories attached, and it requires a crate, padding, and a freight carrier that handles heavy machinery.

Shipping costs vary by distance and carrier. A 350 engine shipped across the country typically costs $800 to $1,500. Shipping within a region may cost $300 to $600. Some sellers include shipping in the price; others charge it separately. Always ask for a shipping quote before you commit to a purchase, and factor that into your total cost when comparing prices.

When the engine arrives, inspect it when ready for damage during transit. Take photos of the crate and any visible damage before you open it. If the engine was damaged in shipping, you will need those photos to file a claim with the carrier. Most freight carriers require you to file a damage claim within a few days of delivery.

Installation and next steps after purchase

Once you have the engine, installation depends on your vehicle and your mechanical skill. If you are replacing an engine in a stock vehicle, a may have access to mechanic can usually complete the job in one to three days. If you are doing a custom swap or building a hot rod, the work can take weeks or months because you may need to modify mounts, wiring, cooling, and fuel systems.

Before you install the engine, have a mechanic inspect it if you did not already do so. They can check compression, oil pressure, and the condition of the block and heads in person. This costs $100 to $300 but can save you from installing a bad engine.

After installation, run the engine at idle for several minutes and check for leaks, unusual noises, or warning lights. Let it warm up fully before driving. If the engine runs rough, overheats, or shows signs of oil or coolant leaks, stop driving and have a mechanic diagnose the problem while the warranty is still active.

Frequently Asked Questions

How much horsepower does a 350 small block have?

Horsepower varies by year and process. Early 350s made around 250 to 300 horsepower. High-performance versions from the 1970s and 1980s made 300 to 370 horsepower. Later 350s made 200 to 310 horsepower depending on fuel injection and emissions equipment. The casting number and year tell you the original rating.

Can I put a 350 engine in a vehicle that did not come with one?

Yes, but it requires more work than replacing an original engine. You will need to modify engine mounts, cooling system, fuel system, and wiring harness to match your vehicle. A mechanic familiar with engine swaps can tell you whether the swap is practical for your specific vehicle and how much labor it will take.

What does it mean if an engine is bored or stroked?

A bored engine has a larger cylinder diameter, and a stroked engine has a longer crankshaft. Both increase displacement and horsepower but may require custom parts and tuning. If a seller describes an engine as bored or stroked, ask for documentation of the work and confirm that the modifications are compatible with your vehicle.

Should I buy a 350 engine online without seeing it in person?

It is riskier than buying locally, but many people do it. If you buy online, ask the seller for detailed photos of the block, heads, and casting numbers. Request compression and oil pressure test results. Use a payment method that offers buyer protection, and arrange for a pre-purchase inspection by a local mechanic if possible before you take delivery.

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

The numbers refer to displacement in cubic inches. A 350 is 350 cubic inches, a 383 is 383, and a 427 is 427. Larger displacement usually means more horsepower and torque, but also higher fuel consumption and different installation requirements. Make sure you are buying the engine size your project actually needs.