2013-2014 Shelby GT500 Engine Guide: The 5.8L Trinity

Mustang fans might not have been ready for the 2013 Shelby GT500 engine, which at the time made more horsepower than any production engine ever built. They welcomed the supercharged 5.8L "Trinity" with open arms anyway. It is powerful. It is loud. It commands your attention and dares you to look away. Developed by Ford's Special Vehicle Team (SVT) and based on the Ford Modular V8 platform, the Trinity also served as the 2014 GT500 engine before bowing out, never used in another production Mustang. More than a decade later, it is still one of the most beloved factory Mustang engines ever made. Here is why.

Why the Shelby GT500

If you know your Mustang history, you probably don't need an answer. The GT500 has been vital to Ford's performance lineup since it was the apple of Carroll Shelby's eye in 1967. For the uninitiated: the GT500 is a monstrous street and drag machine built around unbridled power for straight-line performance. That makes it a counterpoint, and a perfect companion, to the corner-carving, track-ready GT350. Shelby always intended the GT500 to be a horsepower machine, and the 2013 engine held true to that vision with style.

What Kind of Power Is It Packing?

The dual overhead cam (DOHC) 2013 GT500 engine with variable camshaft timing pumped out 662 horsepower, making it the most powerful production vehicle in the world when it launched. It has since been passed by the 5.2L "Predator" in the 2020-plus GT500, which makes 760 hp, but that takes nothing away from what SVT accomplished with the Trinity. Sixty-two hundred and sixty-two horsepower from the factory still humbles a lot of modern metal.

The Power of Design

Almost every choice SVT made was in service of horsepower, which is how this car reached a 200 mph top speed. The 32-valve 5.8L Trinity is force-fed by a 2.3L Eaton TVS twin-screw supercharger sitting in the valley of an aluminum block. Compared to the naturally aspirated 5.0 Coyote in the GT (an engine we love, by the way), the upgrades stack up fast: improved cylinder-head coolant flow, camshafts derived from the Ford GT supercar, and a purpose-built rotating assembly.

Keeping all that boost cool took serious hardware: a large front-mount heat exchanger, a bigger fan, and an upgraded intercooler system. SVT even deleted the grille to feed more air. Back it up with a beefed-up transmission and a carbon fiber driveshaft and you get a factory car engineered end to end for one thing, going fast.

Engine Specs

The numbers are exactly as impressive as you would expect from a car built for one thing. Ford and SVT knew they struck gold, so the 2014 engine did not change at all. Here it is, twice, while you pick your jaw up off the floor.

What Makes It Special?

Yes, it has been surpassed by later Mustang engines, but not by much, and not in character. The 5.8L Trinity still ranks near the top for factory horsepower, backs it up with huge torque, and sounds absolutely vicious, the kind of supercharged snarl every enthusiast dreams about. Because it evolved from the proven Ford Modular V8, it is also durable and responds beautifully to upgrades.

The biggest advantage might be value. Even now, a factory-supercharged 662 hp Mustang is a lot of car for the money, and a clean used example gives you a killer platform that is ready for the strip and hungry for more. Buy right, build smart, and you have one of the best horsepower-per-dollar plays in the Mustang world.

How Much Power Can It Handle?

This is the question that matters before you touch it. The Trinity's factory internals are strong, and mild bolt-ons like a pulley, tune, and induction are well within their comfort zone. Push hard for big boost, though, and you are leaning on the stock rotating assembly harder than SVT intended. That is the root of the "these engines fail" reputation you may have heard, and it is almost always a case of adding power without adding support.

The fix is simple: build the bottom end before you chase the big numbers. Forged connecting rods and pistons, paired with a proper custom tune, turn a fragile high-power combo into a reliable one. Do it in the right order and the Trinity will take a serious amount of power and keep asking for more.

The Best 5.8L Trinity Mods

The 2013 GT500 engine is awesome even if you never touch it. But Mustang fans always have to put their fingerprints on something, and it does not take much to turn the Trinity into a bat out of hell. Here is where we would start:

Popular GT500 Upgrades

2013-2014 GT500 Engine FAQ