Alfa Romeo Engines Explained: Which One Is in Your Car

Search for help with an Alfa Romeo engine and you'll get pages about race cars from the 1930s. No use when your Giulia won't start.

This guide covers the engines in US Alfa Romeos: what they are, how to tell which one you have, and what to do when one fails.

Why Alfa Engine Names Are Confusing

Alfa has built engines for over 100 years, and the names never followed one system. Some use a code like 690T. Some use a size and a name, like 1750 TBi.

Most websites also cover European models like the 147, 156 and 159, which were never sold here. It's easy to spend an hour reading about an engine your car could never have had.

Which Alfa Romeo Engine Is in Your Car?

Three engine families cover almost every Alfa on American roads.

Model	Engine	Code	Power
Giulia, Stelvio (base and Ti)	2.0L turbo four-cylinder	GME T4	280 hp
Giulia and Stelvio Quadrifoglio	2.9L twin-turbo V6	690T	around 505 hp
4C Coupe and Spider (2015–2020)	1,742 cc turbo four-cylinder	1750 TBi	237 hp

 

The 2.0L GME T4 comes from the Stellantis Global Medium Engine family. It shares its basic design with other group cars, but the tuning and several parts are Alfa's own. It's in most Giulia and Stelvio models on the road.

The 1750 TBi in the 4C is all aluminum, built for a car weighing under 2,500 pounds. You won't find it in anything else.

The 2.9L 690T is the one people ask about most.

Is the 2.9 V6 Really a Ferrari Engine?

No. But it's easy to see why people think so.

Alfa built the 690T under Gianluca Pivetti, an engineer who joined from Ferrari in 2013. It uses shapes, materials and technology close to Ferrari's F154 V8, and it's built at Termoli in Italy.

What it is not is a Ferrari V8 with two cylinders cut off. You'll read that on forums, and it's wrong. It's a new engine, designed by someone who had just come from Ferrari.

What matters more for owners: it's rare. About 39,800 were built worldwide between 2015 and 2024, across the Quadrifoglio models, the GTA and GTAm, and the 33 Stradale. Split that across every country and you can see why a replacement is hard to find.

Where to Find Your Engine Code

Four places, best first:

1. Your VIN. The 17-character number at the bottom of the windshield or in the driver's door jamb. It's the only source worth trusting.
2. The engine cover, which shows the engine size on many models.
3. The block, where the code is stamped.
4. Your owner's manual, if you still have it.

Trim matters more on an Alfa than on most cars. A Quadrifoglio takes the 2.9L V6; a Ti or base car takes the 2.0L. Once you know yours, our guide on checking a used engine's mileage and condition covers what to ask before buying.

Good News About the V6

Alfa planned to drop the Quadrifoglio V6 and sell the next models as electric only. That plan has changed. A Collezione series arrives in 2026 with the 2.9 twin-turbo at 513 hp, and models from 2028 are being redesigned to offer petrol engines alongside electric.

That matters to owners. An engine still in production usually stays easier to get parts for.

What to Do When an Alfa Engine Fails

A new engine from a dealer often costs more than an older Giulia is worth, which is why most owners look at a used one. Still weighing it up? Read repair vs replace and our 2026 price guide.

Sort out three things before you order:

• Find out why the first engine failed. These engines are turbocharged. One that overheated or ran low on oil often damaged the turbo too, and a good engine behind a bad turbo will fail as well.
• Check your engine family by VIN, not by the badge on the back of the car.
• Know what you're buying. Engines are sold as a long block: the block, cylinder head and internal parts. Your alternator, AC compressor and wiring move across from the old engine.

Ask your mechanic to replace gaskets, seals, the water pump and timing parts while the engine is out, flush the cooling system, and fit new turbo oil lines. Our installation guide has the full first-start checklist.

Common Questions

Are Alfa Romeo engines reliable?

It depends on care. Turbo engines are less forgiving if you miss oil changes or let them overheat, and cold starts do more damage than people expect. Service history tells you more than mileage. See also how long a used engine lasts.

Should I buy used, rebuilt or remanufactured?

For most Alfa owners, used OEM is the practical choice. The full comparison explains when the others make sense.

Can I put a Quadrifoglio engine in a normal Giulia?

That's an engine swap, not a replacement. It means work on mounts, cooling, electronics and emissions, well beyond a like-for-like job.

How hard is it to find an Alfa engine?

Harder than for common brands, and hardest for the 2.9L V6 and the 4C's 1750 TBi. They move through specialist suppliers rather than sitting on shelves.

Need a Replacement Engine?

We supply tested used Alfa Romeo engines matched to your VIN, each with a 12-month warranty and free shipping. See engines in stock, or contact us with your VIN and we'll confirm which engine your car takes.