A 350 small block is a used engine you can buy as a complete unit, a partial assembly, or a long block, with prices and condition varying widely by source and mileage
The Chevrolet 350 small block is one of the most common V8 engines in the used market because millions were made from 1967 onward and they appear in trucks, cars, and performance builds across decades. When you search for one for sale, you will find complete engines, short blocks (crankcase and internals without heads or accessories), long blocks (short block plus cylinder heads), and crate engines (new or rebuilt). The price difference between these configurations is substantial — a used complete engine might cost $800 to $2,500 depending on mileage and whether it runs, while a rebuilt long block can run $2,000 to $4,500.
Before you contact a seller or shop, you need to know what configuration fits your project, what condition you actually need, and what hidden costs come after purchase. A $600 engine that requires machine work, new gaskets, and a core charge can end up costing more than a $2,000 unit that bolts in and starts.
Key Takeaways
- A complete 350 small block includes the engine block, heads, intake, exhaust manifolds, and accessories; a long block omits accessories; a short block is just the bottom end and requires you to source or transfer heads and intake.
- Used 350 small blocks from salvage yards or private sellers typically cost $800 to $2,500 and may have unknown mileage or internal wear that only shows up after installation.
- Rebuilt or crate 350 engines cost more upfront ($2,000 to $4,500) but come with a warranty and known internal condition, making them predictable for resale or long-term use.
- Machine shops charge $500 to $1,500 to bore, hone, and inspect a used block, plus additional fees for head work, so budget for this before buying a cheap core.
- Shipping a 350 small block costs $300 to $800 depending on distance and whether the engine is complete or a bare block, and you will need a freight carrier or local pickup.
Where 350 Small Blocks Come From and What That Means for Price
Used 350 small blocks enter the market through salvage yards, private sellers parting out old vehicles, engine rebuilders selling cores or remanufactured units, and specialty shops that source and resell engines. Each source carries different risks and price points. A salvage yard engine pulled from a 1990s truck with 150,000 miles might sell for $1,200 to $1,800 because the yard can verify the vehicle history and pull it in-house. A private seller offering an engine from a garage project might price it at $600 to $1,200 but cannot may provide it ran before removal or how long it sat.
Rebuilt or remanufactured 350 small blocks come from shops that disassemble, inspect, and replace worn parts to factory or performance specifications. These engines carry a warranty — typically 12 months or 12,000 miles — and cost $2,500 to $4,500 depending on the level of work. A basic rebuild replaces gaskets, seals, and bearings; a performance rebuild adds forged pistons, ported heads, or a higher-lift camshaft. Crate engines, which are new or newly assembled, start around $3,000 and go higher for performance variants.
Complete Engine Versus Long Block Versus Short Block: What You Are Actually Buying
A complete engine includes the block, crankshaft, pistons, connecting rods, cylinder heads, intake manifold, exhaust manifolds, oil pan, water pump, alternator, starter, and sometimes the carburetor or fuel injection system. This is what you want if you are replacing an engine in an existing vehicle and want to minimize new parts. Complete engines from salvage yards are the cheapest entry point but carry the most uncertainty about internal wear.
A long block includes everything down to the oil pan but excludes the intake, exhaust manifolds, carburetor or fuel injectors, alternator, starter, water pump, and accessories. You transfer these parts from your old engine or buy them new. Long blocks are common from rebuilders because they can control the quality of the internal components (pistons, rings, bearings, valves) while letting you reuse or upgrade the accessories. This setup costs more than a used complete engine but less than a full crate engine.
A short block is just the crankcase, crankshaft, pistons, and connecting rods — everything below the cylinder head gasket surface. You must source or transfer the heads, intake, exhaust manifolds, and all accessories. Short blocks are the cheapest configuration and are common when a builder wants to use specific cylinder heads or performance parts. They require the most labor and knowledge to assemble.
Inspecting a Used 350 Small Block Before You Buy
If you are buying from a private seller or salvage yard, ask whether the engine has been run recently and for how long. An engine that ran for 10 minutes last week is more trustworthy than one that has sat for five years. Request photos of the oil cap area, valve covers, and block exterior — heavy sludge or corrosion signals poor maintenance or long storage. Ask about the last oil change and whether the seller knows the original mileage.
Do not assume a 350 small block that turns over by hand is mechanically sound. Compression testing (measuring pressure in each cylinder) costs $50 to $100 at a shop and reveals whether rings and valves are sealing. A leak-down test (pressurizing the cylinders and measuring how fast pressure drops) costs $75 to $150 and pinpoints whether leakage is from rings, valves, or gaskets. If the seller will not allow testing, treat that as a red flag.
For a salvage yard engine, ask how long the vehicle sat before removal and whether the engine was running when the vehicle arrived. Yards that pull engines same-day or within a week of arrival are more reliable than those that store vehicles for months. Request the vehicle's year, make, and mileage if available — a 350 from a 1995 Suburban with 180,000 miles is a known quantity; a 350 from an unknown donor is a gamble.
Machine Work and Hidden Costs After Purchase
A used 350 small block that passes a compression test may still need machine work before it is safe to run. Boring and honing the cylinders (enlarging them slightly and smoothing the walls) costs $400 to $800 and is necessary if the cylinders are scored, pitted, or out of round. Decking the block (milling the top surface flat) costs $150 to $300. Valve seat work on the heads (grinding the seating surfaces where valves close) costs $200 to $400 per head.
If you buy a short block, you will also need to source or transfer cylinder heads, which can run $300 to $1,500 depending on whether you use stock castings or performance aluminum heads. Intake and exhaust manifolds add another $200 to $600. Gaskets, seals, oil pan, water pump, and fasteners for a complete rebuild can total $300 to $600. A $800 used short block can easily become a $2,500 project once you factor in machine work and parts.
Rebuilt engines from reputable shops include this work and come with a warranty, which is why they cost more upfront. The trade-off is predictability: you know what you are getting and have recourse if something fails within the warranty period.
Shipping, Installation, and Getting the Engine Running
If you are buying from a distance, you will need to arrange freight. A complete 350 small block weighs 575 to 650 pounds depending on accessories. Freight carriers charge $300 to $800 for ground delivery depending on distance and whether the engine is crated. Some salvage yards and rebuilders offer shipping; others require you to arrange it yourself. Always get a quote before committing to a purchase.
Installation labor at a shop typically runs $1,500 to $3,000 for a complete engine swap, depending on the vehicle and whether complications arise (rusted bolts, custom mounts, wiring issues). If you are doing the work yourself, budget for a hoist, engine stand, and gasket sets. A complete gasket set for a 350 small block costs $80 to $150.
After installation, the engine will need to be broken in — running at moderate RPM for the first 500 to 1,000 miles to allow new rings to seat and bearing surfaces to bed in. Do not when ready drive the vehicle hard or tow with a new or rebuilt engine.
Comparing Used, Rebuilt, and Crate 350 Small Blocks Side by Side
| Configuration | Price Range | Warranty | Condition Known | Best For |
|---|---|---|---|---|
| Used complete (salvage) | $800–$2,500 | None or 30 days | Unknown; compression test recommended | Budget builds; experienced builders |
| Used long block (salvage) | $1,000–$2,000 | None or 30 days | Unknown; internal wear not visible | Reusing accessories; cost-conscious swaps |
| Rebuilt long block | $2,000–$4,500 | 12 months / 12,000 miles typical | Known; internal components replaced | Reliability needed; resale value matters |
| Crate engine (new) | $3,000–$5,500 | 12 months / unlimited miles typical | New; factory specifications | Long-term ownership; performance builds |
Frequently Asked Questions
Can I use a 350 from a different year in my vehicle?
Yes, but compatibility depends on your vehicle's year and the engine's year. A 350 from a 1985 truck will bolt into a 1987 truck with minimal changes. Older engines (pre-1986) use carburetors and different engine mounts than fuel-injected engines (1986 onward), so swapping across that divide requires adapter mounts and fuel system changes. Check your vehicle's manual or a Chevrolet forum for your specific swap.
What does "core charge" mean when buying a used engine?
A core charge is a deposit you pay when buying a used or rebuilt engine, refunded when you return the old engine to the seller or shop. Core charges typically range from $200 to $500 and may support the core (your old engine or block) gets recycled or rebuilt rather than scrapped. If you do not return the core, you forfeit the deposit.
Is a 350 small block still a good choice for a swap in 2024?
Yes for reliability and parts availability, but fuel economy and emissions compliance matter. A 350 small block gets 10 to 14 miles per gallon depending on tune and vehicle weight. If your vehicle is street-driven and you care about fuel costs, a modern crate engine or a fuel-injected 350 is more efficient than a carbureted one. For off-road, towing, or vintage builds, a 350 remains practical and affordable.
What is the difference between a 350 and a 383 small block?
A 383 is a 350 block bored to 4.030 inches (instead of 4.000) and fitted with a longer stroke crankshaft, giving it 383 cubic inches of displacement instead of 350. A 383 produces more torque and horsepower but costs more to build and requires custom machine work. For most street applications, a stock 350 or a mildly modified 350 is sufficient and cheaper.
Do I need to replace the oil pan when installing a used 350 small block?
Not always, but it is common practice. Old oil pans often have sludge buildup or corrosion inside, which can clog the oil pickup screen and starve the engine of oil. A new or cleaned oil pan costs $50 to $200 and takes 30 minutes to install. If the used engine comes with a clean pan and you trust its history, you can reuse it; otherwise, replace it.