If you're shopping for a 1uz, you're looking at one of the smoothest V8s Toyota ever built. It powered the first Lexus LS400 back in 1989, and it still shows up in engine swaps today.

Let’s discuss the specs, the differences between the UZ family, and what to check before you buy one.

What Is the Toyota 1UZ-FE?

The 1UZ-FE is a 4.0-litre V8 that Toyota built for its new Lexus brand. It's an aluminium block engine with four camshafts, which was rare for a V8 at that time.

The UZ Engine Family

The Toyota UZ engine family includes three main variants: the 1UZ-FE, the 2UZ-FE, and the 3UZ-FE. Each one served a different purpose, from luxury sedans to trucks.

Production Years and Generations

Toyota built the 1UZ-FE from 1989 to 2000. It first appeared in the 1989 to 2000 Lexus LS 400 and Toyota Celsior, and later in the Toyota Crown, the Lexus SC 400 and Toyota Soarer, the Toyota Aristo, and the Lexus GS 400. There were two main phases: the early non-VVT-i engine and the later VVT-i version.

VVT-i vs non-VVT-i

Non-VVT-i versions made 250 to 261 hp and 260 to 269 lb ft of torque, while VVT-i-equipped versions produced 290 to 300 hp and 300 to 310 lb ft. If you're buying one for a swap, the VVTi version gives you more power and a smoother throttle response, but it also needs more wiring work.

1UZ-FE Specs

Power and Torque by Generation

Generation	Horsepower	Torque	Years
Non VVTi	250 to 261 hp	260 to 269 lb ft	1989 to 1997
VVTi	290 to 300 hp	300 to 310 lb ft	1997 to 2000

Numbers vary a bit depending on the source and the specific application, so treat these as a general range rather than an exact figure.

Aluminium Block, Quad Cam

Toyota built the 1UZ with an oversquare aluminum block and six-bolt main bearings, which helps with rigidity and lets the engine make peak power higher in the rev range. The quad cam layout was unusual for a V8 in 1989, and it's part of why the engine still gets attention today.

Timing Belt Interval

The 1UZ-FE runs a timing belt, not a chain. Most shops recommend replacing it every 90,000 to 100,000 miles. Skipping this is one of the few ways to actually kill this engine, so budget for it if you're buying a used one.

1UZ vs 2UZ vs 3UZ: Which Should You Buy?

1UZ-FE 4.0L

The 1UZ is the lightest of the three and the easiest to fit into a smaller chassis. It's the go-to choice for a car swap rather than a truck.

2UZ-FE 4.7L Truck V8

The 2UZ was built for Toyota and Lexus body-on-frame SUVs and trucks, so it uses a cast iron block instead of aluminum for extra durability, and it first appeared in the 1998 Land Cruiser 100. It's heavier and less common for street swaps.

3UZ-FE 4.3L

Looking for a 3uz engine? This is the most powerful stock version of the family. Introduced in the 2001 Lexus LS 430, it builds on the VVTi 1UZ platform and keeps the aluminum block, cylinder head, and pistons. It costs more, but it's the strongest option if your budget allows it. Check our 3UZ-FE V8 for sale listings if you want to compare current stock.

Which Cars Came With a 1UZ?

Lexus LS400, GS400 and SC400

These three Lexus models are the most common source for a used 1UZ. The LS400 is usually the cleanest option since it was Toyota's flagship sedan.

Toyota Soarer, Celsior and Crown Majesta

On the Japanese market, the Soarer, Celsior, and Crown Majesta all carried the same engine. These cars are a common source for 1uz engine for sale listings here in the US, especially once they clear the 25-year import rule.

Is the 1UZ Really Bulletproof?

The 1UZ has a strong reputation, and for the most part it earns it. That said, no engine is perfect, and a few things do wear out over time.

Known Weak Points

• Timing belt and water pump, which need replacing on schedule

• Knock sensors, a common failure point on higher mileage engines

• Coil packs on later VVTi versions

Starter Location and Labor Cost

The starter sits underneath the intake manifold on this engine, so replacing it takes longer than on most V8s. It's not a common failure, but it's worth knowing before you buy, since labor costs add up quickly here.

What to Inspect Before You Buy

Check the timing belt records first. Then look for oil leaks around the valve covers and check the knock sensor wiring. If you want a broader comparison, we cover this engine alongside others in our post on the most reliable JDM engines.

1UZ Swap Guide

Popular Chassis for a 1UZ Swap

The most common swap targets are the Toyota Supra, the Lexus IS300, and older Toyota trucks. If you're weighing this against other swap options, the 2JZ and 1JZ are the more popular choices for a Mk4 Supra for sale build, mostly because parts support is bigger. The 1UZ still wins on smoothness and low cost per horsepower.

Transmission and Adapter Options

Most builders pair the 1UZ with an A340E automatic or adapt an R154 manual behind it. You'll also see people run Toyota transmissions from other UZ applications with the right adapter plate. Our full step by step JDM engine install guide covers the wiring and mounting side in more depth.

Wiring, ECU and Cooling

You'll need the full engine harness from the donor car, plus either the factory ECU or a standalone ECU if you're changing the intake or ignition setup. Cooling is usually straightforward since the 1UZ runs cooler than most turbo four-cylinder swaps.

Boosting a 1UZ: Supercharger vs Turbo

A supercharger gives you more predictable, linear power, and it's easier to package on some chassis. A turbo setup can make more peak power, but it needs more supporting mods and a stronger fuel system. Either route works well since the bottom end handles boost better than most people expect. If raw power per dollar matters more to you than smoothness, engines like the 2JZ still have an edge, but the 1UZ holds up fine under moderate boost.

What a 1UZ Costs in 2026

Prices for a used 1uzfe engine for sale typically land somewhere between $700 and $1,500 depending on mileage and whether it comes with the wiring harness and ECU. A 3uz engine for sale usually costs more, closer to $1,200 to $2,000, since it's rarer and more powerful in stock form. Browse JDM Toyota engines here to see current pricing on both.

Frequently Asked Questions

What car has a 1UZ engine?

The Lexus LS400, GS400, and SC400 all came with a 1UZ, along with the Toyota Soarer, Celsior, Crown Majesta, and Aristo.

Is the 1UZ or 2UZ better?

It depends on your build. The 1UZ is lighter and better for a car swap. The 2UZ is stronger for towing or truck use since it's built with a cast iron block.

How much HP does a 1UZ have?

Non-VVTi versions make around 250 to 261 hp. VVTi versions push closer to 290 to 300 hp.

Is the 1UZ bulletproof?

It's one of the more durable V8s from this era, but it still needs regular timing belt service and a check on the knock sensors. With basic maintenance, it can easily pass 300,000 miles.