1UZ, 2UZ & 3UZFE Rod
This is the first time someone ever compare them side by side.
The UZFE engines are a mystery to everyone. However, I got
a 3UZFE short block for $50 USD and I am dissecting out for R&D
purposes. In this article I will be comparing the two rods
with precise measurements. The pictures below are to
original rods from Lexus, specifically LS400 and GS430. The
rod on the left is 1UZ and the new rod is 3UZ. From the
first picture of the two rods, you can already tell the
difference and similarity between the two rods. Lets start
with the cap. The 1UZ rod cap seem to be little beefier
with same bolt size for both rods. The larger end diameter
is the same. They both measured 2.165". The small
end is measured .864 respectively for both.
The length of the rods is the same for both
cars. Therefore they should be interchangeable. The
thickness of the ends are equal. The thickness for the
smaller end is .828" and the thickness for the larger end is
So far there are more similarity than
differences. As we move toward the shaft, you will find
out the disappointing specs. The 1UZ rod is actually
beefier then the new rod. The thickness for the rod shaft
is .880" for the 1UZ and .652" for the 3UZ rod. The width
of the rods are appear to be a huge differences. .483" for
the old school rod and .445" for the modern version.
As you read more and see more, you began
to ask yourself. Why would Lexus make such a weak rod on
the 4.3 liter? That is a very good question and it will be
a hot topic for discussion for a long, long time. I don't
have a sensitive scale and I will try to weight them.
However, the two rods are noticeable in weight and size.
The picture below start to pain a picture in your mind. 1UZ
on the left and 3UZ on the right. As for forced induction
application which rod would you choose? Personally, I
would choose the stronger one. Which one is the stronger
The full picture is really telling a story. The noticeable
differences in rod shaft width and thickness.
I really felt the $50 usd was well spent.
I was very surprise to find out the thinness of the 3UZFE rod.
Since the newer engine has larger displacement (larger bore
size), did Lexus tried to compensate larger pistons with lighter
rods? Lighter will rods will rev higher and making up for
the larger bore? Those are very good questions and we
should continue this discussion
|1UZ Vs. 3UZ Specs.
|Crank End (big end) Diameter
|Pin End (small end) Diameter
|Rod length (edge of small and edge of
|Crank End Thickness
|Pin End Thickness
|Rod Shaft Width
|Rod Shaft Thickness
*NOTE: Tundra (2UZFE) rods are
exactly the same as the 3UZFE
The old saying "No School Like the Old School"
is pretty true. Lexus tried to make the rods thinner and
lighter to reduce weight. However, scarifying strength and
durability. I am lextremely disappointed when I open up
the short block. I think the quality of engineering is not
as good as the original introduction in the late 80s. I
also did some mix and match with the UZFE parts. The
pictures below are the 1UZFE stock rod on 3UZFE piston.
Actually the 1UZ rods would be an upgrade for the 3UZFE Rods.
They are perfect fit and bolt right on.
Here are three UZFE rods from 1 to 3 and I also attached a
Lextreme Lightning H Beam
rod. U can see the Tundra and 430 motors have skinny rods.
This is one of the many reasons why TRD stop making the Tundra
Supercharger Kit. The rods are too small and unable to
Here are the official weight from a Pitney Bowes Postage digital
scale. The weight include, the rod, cap and 2 bolts without
1UZFE Rod: 628g
2UZFE Rod: 581g
3UZFE Rod: 581g
To purchase Lextreme Forged H-Beam Rods, please visit
Other articles of interest:
GS430 Block Vs. LS400 Block (3UZ vs.
GS430 Piston Vs. LS400 Piston (3UZ vs.
1UZ Vs. 3UZ Main Fasteners
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