Car Engines

Crate Engines vs. Remanufactured Car Engines

A crate engine is a complete engine assembly shipped ready to install. A remanufactured engine is a used core rebuilt to replace a specific factory engine. Many remanufactured engines ship in crate form, so the real choice is between a direct-fit replacement and a build for more power.

Remanufactured crate engines from ATK Engines are built for specific vehicles. Examples include a 2000 Ford Mustang 4.6L V8, a 2004-2011 Ford Ranger 2.3L L4, and a 2002-2003 Ford F-150 5.4L V8. There's also a 2001 Chevy/GMC truck 8.1L V8. You'll also see options for 2006-2009 Chevy/GMC SUVs with the 4.2L L6 and 2004-2009 Chrysler PT Cruisers with the 2.4L L4.

Choose a remanufactured engine when your original engine is worn out and you want factory-style operation back. Choose a high-performance crate engine when you're building for more horsepower and torque.

Long Block vs. Short Block Engines

A long block engine is the more complete assembly. A short block engine gives you the bottom end and leaves the top end to you. Exact contents vary by product, so check each listing. Here's how the common assembly levels typically compare:

• A short block typically includes the block, crankshaft, connecting rods, and pistons.
• A long block typically adds the cylinder heads, camshaft, and valvetrain to the short block.
• A turn-key engine is typically built to run with fewer added parts, though contents vary by build.

Shop long block engines for replacement builds like the remanufactured GM 3.0L LF1 and GM 2.0L LTG. Choose short block engines, such as the Big Block Chevy 496ci high-performance short block, when you want to pick your own heads and cam. If you're starting from a bare foundation, browse engine blocks.

High-Performance Small Block and Big Block Crate Engines

High-performance crate engines give you a known horsepower and torque rating before you install anything. That lets you plan the rest of the build, including fuel, cooling, and drivetrain parts, around a specific output.

Small Block Chevy options include a 350ci rated at 390HP/420TQ and a 383ci rated at 460HP/490TQ. You'll also find builds rated at 470HP/490TQ, 500HP/505TQ with EFI, and 525HP/515TQ. Small Block Ford choices include a 302ci at 375HP/380TQ, a 347ci at 415HP/430TQ, and a 408ci at 480HP/500TQ.

For Chrysler projects, there's a Small Block Chrysler 408ci at 465HP/535TQ. Big Block Chevy builders can step up to a 496ci rated at 600HP/605TQ. Pick displacement based on your power goal, engine bay space, and how you drive. If you're weighing a late-model GM platform, read our guide to LS vs. Vortec engine specs and swaps.

What You Still Need to Install a Crate Engine

Most crate engines still need supporting parts before they'll run in your vehicle, so budget for more than the engine itself. What's included depends on whether you buy a short block, long block, or turn-key engine.

Induction is the first gap to check. Confirm whether the intake manifold, carburetor or throttle body, and fuel delivery parts are included. Next, check electronics. Late-model and EFI engines may need sensors, a wiring harness, and an engine controller matched to the engine.

Then cover accessories and fluids. The water pump, alternator, starter, belts, and pulleys may not be part of the package. You'll also need headers or exhaust manifolds, oil, and coolant before first start-up. Read each listing for exactly what ships with the engine, then shop engines and engine components for the parts your build still needs.

How to Confirm an Engine Fits Your Vehicle

Start with the Add a Vehicle selector, which filters the catalog to parts that fit your year, make, and model. For a direct-fit remanufactured engine, confirm the size and type match your original, such as a 5.4L V8 for a 2002-2003 F-150.

For swaps, fit goes beyond the vehicle listing. Check engine mount locations, oil pan and crossmember clearance, and hood clearance. Then confirm exhaust routing and the transmission bellhousing pattern. A swap engine that bolts in but can't clear the steering or firewall will stall your project, so measure before you order.

You'll also want to confirm your fuel system, cooling system, and electronics can support the new engine. Our engine swap compatibility checklist walks through what to verify before you order. If anything's unclear, review the fitment notes on the product listing before you buy.