3UZ-FE: Everything You Want to Know | Specs and More

If you’ve read our LS engine article, then you know that engines typically come in families. The 3UZFE is the third, and final engine in the Toyota UZ family. Just like the 2UZ, the 3UZFE is based almost entirely off of the 1UZ. The biggest and most obvious change would be the displacement, which was increased to 4.3L.

The 3UZFE is the least known of the entire UZ engine family, but is it just as good as its big brothers?

3UZFE: Engine Basics

Just like the 1UZ, the 3UZFE has an aluminum engine block. The aluminum engine block helps keep weight down, which is helpful for the heavy luxury cars that it’s installed in. Other than the slightly increased displacement, the 3UZ is just like the 1UZ. It’s a 90* V8, with aluminum heads that are dual over head cam. There are 32 valves (4 per cylinder), and the lifters aren’t hydraulic, so it needs periodic valve adjustments.

RELATED: Toyota 1UZ-FE: Everything You Need to Know


All other UZ engines started out pretty basic, and later received upgrades such as Toyota’s VVT-i. The 3UZFE started out with all the upgrades including VVT-i. This is because the 3UZFE is much younger than the other UZ engines, and it would’ve been ridiculous for Toyota not to use VVT-i on the 3UZ.

  • Production: 2000 – 2010
  • Cylinder Block Material: Aluminum
  • Cylinder Head Material: Aluminum
  • Valve Train: DOHC, 4 valves per cylinder
  • Stroke: 82.5mm
  • Bore: 91mm
  • Compression Ratio: 10.5:1
  • Displacement: 4292cc

3UZFE: Vehicles

Just like the 1UZ, the 3UZFE was designed for luxury cars. It came in a number of different Toyota products, but they were all luxury oriented vehicles. The 3UZFE was equipped in the Lexus GS430, LS430, and SC430. It was also equipped in the Toyota Crown Majesty, and the Soarer.

RELATED: Toyota 2UZ-FE: Everything You Need to Know


  • Lexus GS 430
  • Lexus LS 430
  • Lexus SC 430
  • Toyota Crown Majesty
  • Toyota Soarer

3UZFE: Performance Data

Over the years the 3UZFE had minor upgrades done to it. These upgrades increased horsepower, torque, and fuel economy.

  • 282 horsepower @ 5,600 rpm
  • 307 lb-ft @ 3,500 rpm

Minor revisions were added.

  • 290 horsepower @ 5,600 rpm
  • 320 lb-ft @ 3,400 rpm

Once again, minor revisions were added.

  • 304 horsepower @ 5,600 rpm
  • 325 lb-ft @ 3,400 rpm

As you can tell from these numbers, there were only slight gains in horsepower. Most of these gains were a result of computer re-calibration, and the physical parts were left unchanged.

1UZFE vs 3UZFE: What is the Difference?

Like I mentioned before, the 3UZ is heavily based on the 1UZ engine. But what are the actual differences? The 3UZ has a larger bore, and thinner cylinder sleeves. The 3UZ’s pistons are lighter and larger to accommodate the cylinder bore. The 3UZ also has improved water passages which lowered combustion chamber temperatures.

The 3UZ also had technological advancements such as Lexus’s electronic throttle body. For the full list of all difference between the 1UZ and 3UZ, please visit LexusV8engines.co.va.

3UZFE: Tuning Potential

If you are a car guy or gal, chances are that this is the part you were waiting for. What can the 3UZ really do? Can be it be transformed from its boring stock form into a street monster? Well, I had both good and bad news for you. Good news; its nearly identical to the 1UZ, and can make power as easy as the 1UZ. Bad news; its severely limited by the stock block.

RELATED: Here’s Why You NEED a Lexus Sc300/SC400


The 3UZ is a double edge sword. Its super awesome because its mostly the same at the 1UZ, which can make tons of power really easily. The reason that the 3UZ is limited by the stock block is the bore size. The cylinder block is identical to the 1UZ’s, but the larger bore of the 3UZ decreases the size of the cylinder sleeves. Those thinner sleeves limit the 3UZ to around 600 horsepower on a stock block.


As long as you’re not pushing your car past 600 horsepower, than the stock block will work just fine for you. One of the most common modifications to the 3UZ is adding a Terminator Cobra supercharger, or Eaton M90 supercharger. This quickly bumps the horsepower up to an impressive 360+ at just 6 psi. With a built bottom end, the 3UZ can reach 420+ horsepower at 10 psi. Like I said, it is limited by the stock cylinder sleeves, so you don’t have to be very careful when adding boost.

3UZFE: Summary

So as you might have figured out by now, the 1UZ and the 3UZ are basically the same. They share a large amount of their components, and make similar power. The difference worth mentioning is that the 3UZ is much weaker than any other UZ engine. Let me know what you think about the 3UZFE in the comments below.

About Bryce Cleveland 447 Articles
Bryce founded Dust Runners Automotive Journal in 2014 as a way to write about the cars he found interesting. He currently owns a 2003 Honda CRF450R Supermoto, 2006 Nissan 350Z, and a 2018 Yamaha MT09. Follow him on Instagram for more @bryce.cleveland.


  1. Hello Bryce,

    Would you happen to know who can build me a 600+ Reliable Horsepower 3UZ-FE Race Engine to compete in GT Entry Level Class Circuit Racing. ??

    • Hi Fred. Try Hartley engines and motorsport in NZ. They build race spec 1GZ V12s from the Toyota crown that make over 700Hp!and build race 1UZ engines as well. Yes, thats the same Hartley as F1 driver Brendon Hartley

  2. Not everything!
    1) What is the bank to bank angle?
    2) Will it benefit from a 4-7 swap?
    3) Are cams and ECM available for a 4-7 swap?
    4) Will a supercharger fit under the hood of a 2004 Lexus LS-430?

  3. I just got a gs430, and reading over what you posted about the 3UZ-FE and I was wondering if there is a way to mod ” the stock cylinder sleeves” so it bust on me when I boost it, I want at lest more then 600+, I’m currently looking into manual swap, and tips to go about more HP and boost.

  4. Recently my knock sensors caused a problem and we replaced them with generic ones. No big deal, I guess. Except with these, the car would behave in one of three distinct ways. Normal, as before… or limp home mode, or crazy redhead screamer! It’s personality would change as you drive it. Don’t like it now? Turn off the key for a moment and allow it to reboot. You’ll either get standard back, or if you’re lucky the redhead would come out to play. The read head burns rubber from a rolling stop and pulls hard immediately when you touch the gas, never hesitating.
    Any ideas how I can get a date with her again, now that we had to replace those new knock sensors with OEM?
    Now that I know what is possible, this is boaring.


  5. I find your comment regarding the “thinner sleeves” on the 3uz very confusing. You’re not the first person to mention this, by the way.
    Lextreme stripped both the 1 and 3 uz engines and found the sleeve thickness to be identical at .187″.
    It seems as if you are imying that the 3uz is merely a 1uz with massive rebore, hence the thinner sleeves. This is of course not true.
    So, I would like to know rxactly what you mean when u say the sleeves are thinner??
    Do you perhaps refer to the section deep in the block closer to the crank??

    Please clarify this for me.


  6. Good evening,
    I have a Lexus 3UZFE in my Nissan Hardbody with auto box, I changed my diff ratios as my top end was 135km/h max then she would cut out (limit), now my top end is 162km/h then she cuts out. My aim is around 185km/h for overtaking mostly, is there anyway that I could achieve this speed? Thanks in advance guys.

  7. can anyone tell me about the differential(final gear) value of 3 UZ FE 6 SPEED installed in Toyota Crown Majesta

  8. good day I have installed a 3uz-fe vvti in my gwm steed 2012
    it feels like my gearbox is running very high on temperature
    what can I do to reduce fuel consumption

  9. will a eaton m65 supercharger work on the 3uz-fe vvti.
    what do I need to change on the motor to fit the supercharger

  10. Hi
    I am soon to start my lifelong project of building a Morgan. I’ve wanted to put a 3UZ into it but have been told that it would not meet today’s emmission control standards, is this the case?

  11. What i’d like to know is what can i do to get my 06 GS430 up to 350-400 horsepower without doing a $5,000 supercharger. im looking for simple bolt ons/tuning. i dont need a 600hp monster. what can be done for a mild build?

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  1. 1UZFE: Everything You Want to Know | Specs and More
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