This is a SCAT Stroker Series 9000 331 Rotating Assembly and this is gonna appeal to those
push-ride [SP] to 5 liter owners out there that are looking to punch their 302 out to
a 331 in a relatively inexpensive way.
A kit like this takes a lot of the guesswork out of assembling an engine.
And this kit'll come with a 9000 Series lightweight cast crankshaft, forged I-beam connecting
rods, forged flat top pistons, a main bearing set, rod bearing set and a piston ring set.
This kit is gonna be a great option for someone looking to build a naturally aspirated street
strip performance build.
Compression ratio with this kit will change depending on your cylinder head combustion
chamber.
I'm gonna give you guys a range, but I'll have more info on that later on.
And this is an unbalanced kit so you will need to have it balanced before install or
operation.
You can do that with a 28-ounce harmonic balancer and a 28-ounce flywheel.
I probably don't have to tell you guys this but the install for a kit like this is a full
three outta three wrenches in the difficulty meter.
So a stroker kit is all about increasing the stroke of a piston in the engine which increases
the displacement of the engine and allows it to generate more horsepower.
In other words, the piston will travel further up and down, and it's a relatively quick way
to increase the displacement of an engine and give more room for more air and more fuel.
The cubic inch measurement of the engine refers to the amount of air that can be moved every
two revolutions.
This is a 331 kit, so your standard 302 will move 29 cubic inches more which gives you
a 9.6 increase.
Now, of course, your exact power gains will strongly depend on your setup and what other
mods you have.
So I can't really throw a power number out there because of that.
And speaking of other mods, I have to circle back around to that compression ratio with
this kit.
Your exact compression ratio will depend on your cylinder heads and the size of the combustion
chambers in the heads.
If you go with a set of 58cc heads, the compression ratio will be 10.4 to 1, 64cc heads will give
you 9.7 to 1, and 70cc heads will give you 8.9 to 1.
So in case you didn't catch on to that, the larger the combustion chambers in the heads,
the lower the compression ratio will be.
That's something you definitely have to keep in mind with this kit since it is gonna have
a huge impact on your end results.
So if you want a high compression ratio build, say, to keep things NA or for nitrous, you'd
wanna stick with heads that have smaller combustion chambers.
But if you're thinking about a forced induction build, you might wanna consider going with
a lower compression setup.
So you need a set of cylinder heads with larger combustion chambers.
If we look at this kit in more detail, and we'll start with the crank, this is a SCAT
9000 Series crank.
This is a cast crankshaft but it's lighter than the factory crankshaft with a different
design to it.
It's designed after SCAT's custom billet crankshaft.
It has lightening holes in all of the rod journals and aero wing counterweights, as
well as straight-shot chambered oil holes in all of the rod journals.
And all of the journals have a large radius.
It's also been precision ground and micro polished too to exact tolerances so it's all
ready for install.
Next, you have SCAT's Pro Stock I-beam 4340 forged connecting rods, and these are in brush
pin design, and of course longer than the factory rods.
The factory rods are about 5.09 inches long and new rods in this kit are 5.4 inches long.
So you can see where part of the difference in the piston trope [SP] will be coming from.
The lightweight I-beam design helps with horsepower and with faster RPMs.
These come to you 100% ready to install and they have ARP 12-point cap screws and a down
[SP] cap for specific cap-to-rod alignment which is a nice little upgrade.
The last main component will be the forged flat top pistons, which will include your
piston rings and pins.
Of course, these are a big upgrade over your stock pistons.
They are 30 over so you might need to factor in some light machining or honing.
And lastly, still in the packaging, you have your rod and main bearings.
So you get a complete kit from SCAT that you know will work together.
When it comes to price, you're looking at just over $900 for this kit.
Now, this is very affordable in my opinion, especially when you consider what you're getting
here with this stuff being both upgrades and being a complete kit.
This is kit'll help you push the limits of the five-liter block and give you a much more
hardy setup.
I do have to caution you though, keep in mind the limits of the five-liter.
But I'm sure your tuner will help you with all of that.
SCAT also has a 347 kit that is much like this kit here or you could pick up a 331 or
347 forged assembly if you really wanted to splurge.
As far as the install goes, this is a full three outta three wrenches on the difficulty
meter, and you can expect it to take anywhere from one day to a few days depending on your
experience and your tool availability, and also on any machining work.
This is something that a lotta people would take to a shop to install just because it
is complex.
You have your complete teardown and rebuild of the entire bottom end to consider.
So if you're not really an engine builder, that might be your best bet.
That's gonna wrap things up for the SCAT Stroker Series 9000 331 Rotating Assembly.
You can check it out more online right here at americanmuscle.com.