Thinking About an Engine Swap? Here’s How It Works

When an engine has a spun bearing, a cracked block or just too many miles, replacing it can be the smartest way to keep a vehicle you otherwise like on the road. Here’s what goes into an engine swap and what to think about before you commit.

Types of engine swaps

• Direct replacement: the same engine your vehicle came with, either used, remanufactured or a new long-block. This is the most common and most affordable route.
• Same-family swap: a different engine from the same manufacturer, such as a larger GM V8 into a truck that came with a smaller one. It usually needs some wiring and computer work.
• Custom swap: an engine from a different platform entirely. Expect fabrication, custom wiring and tuning.

Swap or repair?

If the damage is limited to the top end (head gaskets, timing components, cam and lifter failures like AFM/DOD issues), repairing the original engine is often cheaper. If the bottom end is damaged or the engine has very high mileage, a swap is usually the better value. We’ll tell you which way we’d go and why.

What the job involves

• Pulling the old engine and inspecting mounts, hoses and the transmission connection.
• Transferring or replacing sensors, intake, accessories and any parts that should be new (water pump, seals, gaskets).
• Installing the engine, connecting fuel, cooling, exhaust and wiring, and programming or tuning the computer if needed.
• Priming, startup, checking for leaks and codes, and road testing.

We’ve done plenty of engine swaps on trucks, SUVs and cars. If you’re weighing a swap against a repair or trading the vehicle in, we’re happy to talk it through.