A 350 small block crate engine is a complete, ready-to-install V8 engine built to Chevrolet's original specifications or modern performance variations, sold as a single unit rather than assembled from individual parts.
The 350 small block refers to the engine's displacement — 350 cubic inches, or about 5.7 liters. Chevrolet produced this engine from 1967 through 2002, and it remains one of the most common V8s in American vehicles. A crate engine is a factory-built or professionally remanufactured version shipped complete with cylinder block, heads, crankshaft, pistons, and internal components already assembled and tested. You bolt it into your engine bay, connect fuel and ignition systems, and it runs.
Crate engines come in two main types: stock replacements that match original specifications, and performance variants with higher compression ratios, modified cam profiles, or upgraded internals. The choice depends on whether you need a direct replacement for a failed engine or want to increase horsepower and torque in an existing vehicle.
Key Takeaways
- A 350 small block crate engine arrives fully assembled and tested, requiring only installation and connection to fuel, ignition, and cooling systems.
- Stock crate engines cost less than performance versions but deliver the same output as original 1980s and 1990s Chevrolet engines.
- Performance crate engines with higher compression, modified cams, or aluminum heads cost more but add 50 to 150 horsepower over stock versions.
- Installation labor typically runs 20 to 40 hours depending on your vehicle's engine bay layout and whether you keep original fuel and electrical systems.
- A crate engine does not include transmission, engine mounts, or exhaust components — you reuse or purchase these separately.
Stock versus Performance 350 Crate Engines
A stock 350 crate engine reproduces the original Chevrolet specifications from a particular year, usually the 1980s or 1990s. These engines typically produce 200 to 250 horsepower and 300 to 350 pound-feet of torque, depending on the year modeled. They cost less than performance variants because they use cast-iron heads, a standard compression ratio, and a mild cam profile. Stock engines work well as direct replacements in vehicles that originally came with a 350, or in older trucks and cars where the original engine failed.
A performance 350 crate engine modifies one or more internal components to increase output. Common upgrades include aluminum cylinder heads (which improve cooling and reduce weight), a higher compression ratio (9.5:1 or 10:1 instead of 8.5:1), a more aggressive cam profile, and upgraded valve springs. These changes typically add 50 to 150 horsepower and 50 to 100 pound-feet of torque. Performance engines cost $2,000 to $4,000 more than stock versions but deliver noticeably faster acceleration and higher top-end power. They require fuel with at least 91 octane and may need tuning to run optimally in your specific vehicle.
Some manufacturers offer mid-range options with aluminum heads and stock compression, splitting the difference in cost and performance. Compare the specifications — compression ratio, cam profile, horsepower rating, and torque curve — against your vehicle's weight and intended use before choosing.
What Comes Inside a Crate Engine and What You Supply
A 350 crate engine includes the cylinder block, cylinder heads, crankshaft, connecting rods, pistons, timing chain, water pump, oil pump, intake manifold, and valve covers. It arrives with spark plug wires or coil packs already installed on most units. The engine is pre-assembled, tested on a dynamometer to verify horsepower and torque output, and shipped with a warranty — typically 12 months or 12,000 miles for stock engines, sometimes longer for performance variants.
You must supply or reuse several components not included in the crate engine. The transmission bolts to the back of the engine; you keep your existing transmission or purchase a new one. Engine mounts bolt the engine to the frame; these are usually vehicle-specific and sold separately. The exhaust manifolds or headers bolt to the cylinder heads; original manifolds often fit, but headers require custom fabrication or a kit designed for your vehicle. Fuel injectors and fuel rail (or carburetor for older-style engines) connect to the intake manifold. Alternator, power steering pump, and air conditioning compressor bolt to brackets on the engine block; you reuse your original units if they fit, or purchase new ones.
The cooling system — radiator, hoses, thermostat, and water pump — must be compatible with the engine's flow rate and temperature range. Many builders upgrade the radiator when installing a performance engine to handle higher heat output.
Installation Labor and Mechanical Considerations
Installing a 350 crate engine typically requires 20 to 40 hours of labor, depending on your vehicle and the shop's experience. A vehicle that originally came with a 350 — such as a 1970s–1990s Chevrolet truck, Camaro, or Corvette — usually falls on the lower end because engine bay layout, mounts, and fuel systems are already designed for that engine. Swapping a 350 into a vehicle that never had one, or into a modern engine bay with tight clearances, can push labor toward 40 hours or beyond.
Shops charge $75 to $150 per hour for engine installation, so total labor costs range from $1,500 to $6,000. Some shops offer flat rates for common swaps — a 350 into a 1970s Chevrolet truck, for example — which can be cheaper than hourly billing. Get a written estimate before work begins, and ask whether the quote includes engine tuning, exhaust fabrication, and fuel system modifications.
Mechanical considerations include engine bay clearance (headers and air intake must fit without hitting the firewall or radiator), fuel system pressure (modern fuel-injected engines need 45–60 PSI; older carbureted engines need 4–7 PSI), and electrical compatibility. If your vehicle has an older wiring harness, the shop may need to upgrade it to match the crate engine's ignition and fuel injection system. Some builders use standalone engine management systems to avoid wiring headaches, which adds cost but simplifies installation.
Cost Breakdown for a 350 Crate Engine Installation
| Component | Stock Engine | Performance Engine |
|---|---|---|
| Crate engine (long block) | $3,000–$4,500 | $5,500–$8,000 |
| Installation labor (20–40 hours) | $1,500–$6,000 | $1,500–$6,000 |
| Engine mounts, brackets, gaskets | $300–$800 | $300–$800 |
| Exhaust manifolds or headers | $400–$1,200 | $600–$1,500 |
| Fuel system upgrades (if needed) | $200–$600 | $300–$1,000 |
| Radiator upgrade (if needed) | $0–$400 | $300–$800 |
| Estimated total | $5,400–$13,500 | $8,600–$18,100 |
These ranges assume you reuse your existing transmission, alternator, and air conditioning compressor. If any of those components need replacement, add $500 to $2,000 per item. Prices vary by region, shop reputation, and the specific engine model you choose.
Warranty and Long-Term Reliability
Most crate engine manufacturers warrant their engines for 12 months or 12,000 miles from the date of purchase, whichever comes first. Some offer extended warranties of 24 months or 24,000 miles for an additional fee. The warranty typically covers internal engine defects — cracked blocks, bad pistons, valve problems — but not installation errors, fuel system issues, or damage from improper tuning or maintenance.
A properly installed and maintained 350 crate engine should last 100,000 to 150,000 miles or more. Stock engines tend to be more reliable than performance variants because they run at lower stress levels. Performance engines with higher compression and aggressive cam profiles require regular oil changes (every 3,000 to 5,000 miles), quality fuel, and proper tuning to avoid premature wear. Some builders recommend synthetic oil for performance engines to improve cooling and reduce friction.
Keep all receipts and documentation from the installation shop. If a problem arises within the warranty period, you will need proof of purchase and installation date to file a claim with the manufacturer.
Finding a Reputable Shop and Choosing the Right Engine
Look for shops with experience installing 350 crate engines in your specific vehicle model. Ask for references, check online reviews, and visit the shop in person to see their work. A good shop will explain what's included in the crate engine, what you need to supply, and what modifications your vehicle requires. They should provide a written estimate and timeline before starting work.
When choosing between engine suppliers, compare horsepower ratings, compression ratio, cam profile, and warranty terms. Ask whether the engine has been dyno-tested and request a copy of the test results. Some manufacturers offer engines with different carburetor or fuel injection options; make sure the fuel system type matches your vehicle's setup or your willingness to modify it.
Buy the crate engine from a reputable supplier — Chevrolet Performance, Edelbrock, Jasper Engines, or a local machine shop with a track record. Avoid unknown sellers offering unusually low prices, as the engine may have hidden defects or misrepresented specifications.
Frequently Asked Questions
Can I install a 350 crate engine myself if I have basic mechanical skills?
Engine installation requires specialized knowledge of fuel systems, electrical wiring, cooling systems, and exhaust fabrication. Most DIY mechanics can handle bolt-on components like intake manifolds or valve covers, but full installation is best left to a professional shop. Mistakes in fuel pressure, ignition timing, or cooling system setup can damage the engine or create safety hazards.
What's the difference between a long block and a short block crate engine?
A long block includes the cylinder heads, intake manifold, and valve covers. A short block includes only the block, crankshaft, pistons, and connecting rods — you must buy and install heads, manifolds, and accessories separately. Crate engines sold for vehicles are almost always long blocks, ready to bolt in with minimal additional parts.
Will a 350 crate engine fit in my vehicle?
A 350 fits most Chevrolet vehicles from the 1960s through 1990s that originally came with a V8. Swapping into a four-cylinder vehicle or a vehicle with a different engine bay layout requires custom mounts and modifications. Ask your installation shop whether a 350 is feasible for your specific vehicle before purchasing the engine.
Do I need to tune a stock 350 crate engine after installation?
Stock engines usually run without tuning if the fuel system pressure and ignition timing are set correctly during installation. Performance engines with higher compression often benefit from tuning to optimize fuel timing and air-fuel ratio, especially if your vehicle has an older fuel system or carburetor.
How much horsepower will I gain compared to my original engine?
That depends on what engine your vehicle originally had. A stock 350 crate engine typically produces 200–250 horsepower. If your original engine produced 150 horsepower, you gain about 50–100 horsepower. A performance 350 can produce 300–400 horsepower, a gain of 150–250 over a worn original engine. Ask your shop to dyno-test the installed engine to verify actual output in your vehicle.