(approx) a Weekend
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So the Scat Stroker Kit that we have here in this video should appeal to all pushrod 5-liter owners out there looking for a relatively affordable turnkey kit to increase the displacement in your 302 to 347 cubic inches. Now, this kit will be centered around the Scat 9000 Series Cast Crankshaft, which, according to the company, is rated up to 500 horsepower, making this a great choice for any naturally aspirated, forced induction, or nitrous application. Now, this kit from Scat will also include brand new forged I-beam connecting rods. It's also going to include forged pistons here, which are .030 over, so prospective buyers will need to factor in a little bit of machining work to get everything installed. Compression ratio will vary, depending on your cylinder head's combustion chamber. It's gonna range anywhere from 11 to 1 to roughly nine and a half to 1, but I am gonna have some more detail on that later in the video. Prospective buyers will also need to be aware of the fact that this kit is unbalanced, meaning you're gonna have to have it balanced before installation or before operation using a 28-ounce balancer along with a 28-ounce flywheel. Obviously, this is gonna be a very complicated install, guys, so expect a full three out of three wrenches on the difficulty meter with a little bit more detail later on in the video.But first things first, let's talk about a stroker kit, and it is exactly what it sounds like. A stroker kit is designed to increase the stroke in any engine, thus increasing the displacement in the process. Now, contrary to what some people might think, cubic inches doesn't refer to the physical size of the motor, but rather the amount of air it can move every two revolutions. So with all that said and with this kit installed, your standard issue 302 is now capable of moving 15% more air, thanks to that 45-cubic inch bump, which, in turn, should theoretically add more power, depending on your setup. And I do wanna stick with that word "setup" here for a couple of reasons, guys, because ultimately that will be a big determining factor for you, depending on your setup. First and foremost, let's talk about the compression ratio, again, because you will need to factor in your heads and, more specifically, your combustion ratio size to determine your ultimate, final compression ratio. For instance, guys, if you wanted to build a higher compression NA or nitrous motor, you might wanna consider going with a set of heads with a 58cc combustion chamber, thus giving you an 11 to 1 compression ratio with the Scat kit installed. On the other hand, if you're thinking about forced induction, you might wanna go with a lower compression setup. For instance, a 64cc head will deliver a 10 to 1 compression ratio with this kit, while going with a bigger 70cc head will deliver a 9.6 to 1 compression ratio with the Scat kit installed. So again, guys, you have a lot of things to consider when building a motor for your specific setup. But with that said, let's break down what you are receiving here with the Scat kit, and at its core, you are receiving the Scat 9000 Series Cast Crankshaft, which will allow for that longer stroke overall, setting the foundation for the 347 kit. Now, the Scat 9000 Series Crankshaft, while still cast, is gonna be lighter than your factory crankshaft, thanks to a couple of design cues. Most importantly, you're gonna be looking at some lightning holes in all the rod throws, some aero-wing counterweights here that will help produce less windage overall. The crank has been precision-ground and does feature micro-polished journal areas as well. But, of course, you can't have a stroker kit without the proper length rod, so included with this kit, you're gonna be receiving eight Pro Stock Forged I-Beam Connecting Rods, complete with ARP three-eighths inch hardware. A nice little upgrade, by the way. Just for reference sake, guys, a stock 302 rod is essentially 5.09 inches long, give or take. Well, the new rods here from the Scat kit are 5.4 inches long, so you can kinda see where some of that extra stroke is coming from when paired with the Scat crankshaft.Last, but certainly not least, you will be receiving some brand new forged flat-top pistons here as well with brand new included wrist pins, as you can see. And these guys are just gonna be a huge upgrade over the stockers, right? They are a .030 over compared to your factory piston, so you will need to factor in some light machining or honing. And then, last but not least, in addition to those pistons, completing the package, you have your total seal rings brand new in the box. Now, the reality is, guys, the factory rods, and crank can handle some decent abuse. However, the factory pistons, not so much. So to be including or introducing some brand new forged pistons, along with the beefier rods and crank, well, your setup should be ready to handle some serious power.But of course, there's the elephant in the room, and that is the fact that the 302 block has been known to crack as power levels start climbing. Now, if you search around the internet a little bit, you'll probably find a few different numbers, but in my experience, general consensus, anywhere around 500 horsepower is when you really have to start worrying about potential breakage. So yes, even though these components are built to handle a lot of power, you do have to factor in your block as well. Now, I would say, guys, if you plan on making 400-plus, 450-plus horsepower, you might be better off just starting with a dart block or maybe even a 351 block, as they are known to handle a lot more power safely.But talking about pricing a little bit here, guys, I feel the Scat stuff is all very affordable in the land of aftermarket engine internals. Case in point, you're gettin' brand new forged pistons, forged I-beam connecting rods, cast crank, but they're also throwing in everything else you need, from the piston rings down to your bearings, both rod and main bearings as well, and more for south of $1,000 bucks. All you need to do is provide your block and some machining, and you are good to go.As far as your installation is concerned, well, what more can I say, guys? This is gonna be a full three out of three wrenches on the difficulty meter, anywhere from a full day to two days or maybe even more, factoring in some machining work, to get everything torn down and put back together again. So to keep things short and sweet, guys, if you're not comfortable with engine building, you might wanna leave this one up to your local machine shop.Wrapping things up here, guys, if you're looking to increase the displacement in your 302-based engine and you wanna strengthen things up in the process, all for south of $1,000 bucks, then you're definitely gonna wanna check out the Scat 347 Stroker Kit, right here at americanmuscle.com.
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Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Details
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April 05, 2018
I LOVE this kit. Finished my motor a few weeks and its fantastic. The parts are extremely well build, and if you are looking to do a build some some boost or any decent horsepower this is one the best way to go for internals at a decent price!Helpful (8)
January 19, 2018
347 stroker kit
I received my scat 347 stroker kit shipping was fast everything in the Box was great nice kit can't wait to get it done thanks American Muscle you guys rock keep up the good workHelpful (7)
December 06, 2016
Great Product For the Money
I was very impressed with the pistons, rings, and bearings that came with the kit. All good quality stuff. Can't wait to run it.Helpful (10)
January 08, 2015
This product fit my interest in being able to spray more nitrous
I was thinking one day what quick kit should i get for my bigger pound bottle of nos so i went the scat 347.Helpful (9)
April 05, 2014
My 85 302 was dying a slow death, I had it rebuilt with this kit and the e303 cam. The motor is throaty and has more than enough power. its worth the time and effort to get those extra cubic inchesHelpful (21)
Can I use this kit with a factory 94 Cobra 5.0 Camshaft? Or does the cam need upgrading as well?
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly can be installed with the stock camshaft, however it is not anywhere near optimal for this setup. This kit is designed to be used with aftermarket heads, intake manifold, and camshaft for optimum performance.
Would this work with the trick flow top end kits?
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly has valve reliefs compatible with standard valve locations, or Trick Flow Twisted Wedge heads.
Can someone get dish pistons with this kit? My heads are 58cc, and I need lower compression for turbo application. This is going in a 1998 ford Ranger.
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly is only available with Forged Flat Top Pistons. Additionally, we can only guarantee fitment for a 79-95 5.0L Mustang.
Is this CA smog legal?
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly will be Carb approved yes.
I have a 95 GT with stock internals except a Ford B Cam, would this kit work for my setup? Edelbrock 1.94cc heads, 94-95 Cobra intake, full Mac exhaust and a vortex V3 blower pumping out 452 hp at flywheel. Is this the right kit or can you suggest the best kit for my set up?
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly would work with your Mustang. Machining will be required. One thing to consider is that 500-550hp is typically considered the 'safe' limit of the stock engine block, as they have a tendency to split in the valley and in the main webs after this.
Hello, NathanWT5U2071209 There is no horsepower numbers listed however this is a cast crankshaft with that being said if you're looking to go very big in horsepower you would want to consider a forged crank (100534) I have provided a link below. https://www.americanmuscle.com/scatstroker-347-forged-7995.html
At this timer we do not offer the Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly with any bore other than for motors bored .030" over.
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly can be used in stock block applications when the block has been bored and clearanced for a stroker kit. This can also be used with after market blocks as well. Keep in mind that the typical power limit of the stock block is around 500HP before it begins to fail.
It is difficult to say an exact figure for power production on your motor with the Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly as we do not know which cylinder heads you are using, however, you should expect a range of 350-400hp, depending on this and several other small variables such as header type, tb size, MAF size, etc.
The Scat Stroker Series 9000 347 ci Street-Strip Rotating Assembly utilizes Icon Forged Racing Pistons.
Here's the best I can do with the info you supplied. To make 600rwhp you'll need 675 at the fly wheel on a standard and 725 on a automatic. A 2 bolt main block won't put up with that real long. Next week link is the cast crank Scat makes good stuff but cast stroker cranks don't like to spin over 7000rpm without having issues. You could do 500hp all day at the fly wheel with this kit safely in a 2 bolt main block. Up grade the caps and use ARP studs you will need a line hone when it's done to true the crank bores.
That would definitely help you yield higher power from your combination. A street/strip car with a Hydraulic roller cam is a good choice because you won't have to make adjustments to the valve lash settings. A Mechanical roller or Solid roller is more suitable for a track car that is tweaked and adjusted regulary but will give higher HP/TQ numbers plus a higher RPM range. If you go Hyd. roller check out AFR's Hydro lok kit that allows hyd. roller cams to operate at higher rpms than a engine without one. It keeps your rollers on the lifters in contact with the cam lobes.
We do not offer products for pre-1979 models.
Yes, this includes the main and rod bearings.
(approx) a Weekend
Mechanical expertise or professional installation required.
What's in the Box