1970 GTX 440 - Classic Mopar Dyno Tested Before & After Rebuild

Let's see how it goes. The carburetor is not rebuilt. I haven't rebuilt it yet but it works fine. This is the carburetor that comes with the super commando. It's a magic automatic carburetor and by the way, I just want to show you the carburetor that Donnie Orkey just made. Ontario, who just built and restored my

1970

Magnum carburetor, just like Drew has on his GTX. This is the four speed one. It's the carburetor that matches my Kawasaki Challenger, which I'm going to put in in the summer when I take it out. storage and just to show you the difference before and after, take a look, they are the same carburetors except for the numbers because it is a four speed that is an automatic, but after all it is a beautiful piece of equipment, so I'm going to have my uhCustomer, I'm going Call my customers if they want to do the same because Donnie has quite a few things to do with a lot of carburetors at the moment, but in the meantime I just wanted to show you the kind of work he's done. and he's done a great job on this for me so I have to give credit to uh don here it's called the carp boys incorporated here if you Google you'll find his phone number.

He does a great job. It's fair. about their prices and it's here in Ontario, then in the end I'll test it like I did with my Kawasaki with the original dual snorkel air filter, but this is a Plymouth, they call it a super commando, but mine was a Dodge, They call it a Dodge uh 440 magnum so this is a 440 super commando. There's the same air filter but a different nameplate or pipe plate so let's get it up and running. We'll do a test where it is now and after that. We're going to put the air filter in and see what the results will be and if all goes well after the

dyno

test, we're going to put a new coat of paint on this detail and put it on the car, anyway.

Let's do this 440 like I said before, we just did a little minor work on it, did some port work, boarded 30 with flat top forged pistons, installed a set of eagle rods and then did a report. Work with Mopar templates on your original 906 parts. What Drew wanted was a stock engine built to the same specs as my Kawasaki 440. The only difference is on my Kawasaki 440, not the stock engine, the test food I got on the car right now. We had the 452 castings installed on that engine and we have Drew's 906 heads right here, so you know that's the only difference between the two engines we have here.

Both are genuine originals from

1970

, same carburetors, same intake manifold, same flat top pistons. platform zero and we have the same cam I'm using, the factory pushrods with rocker arms, I'm using the factory oil pan which is a six quart crankcase and one of my favorites, a high pressure nosy oil pump factory and exactly screwed to the right. where it lines up with the uh port for power, so it's perfect, I can't ask for anything more like the factory valve covers. I installed a new eight blade water pump, now I installed an oil temperature gauge right here and that's it.

It's an old unit but it could leak a little oil right here and I'm not crazy about that. I don't care one bit. My concern is the rear seal so let's do some tests and at the same time look for the rear seal, I'm saying some oil will be lost so we're about to start and see what the difference will be between the power we had before and Now, okay, let's turn on the computer. Can. Don't wait to see Drew's gtx, uh, run on the

dyno

, uh, to see, uh, what it's going to do we've been waiting four months for this, so yeah, there you go, let's start the test at 2500 rpm and take it up to 5400. rpm at 300 rpm per second, so let's warm it up, let's get started.

Put my O2 sensor on the water pump. Works. Alright. Make sure you put the pedal to the metal. Alright. We are ready and I am ready. Here we go, so strange. So, you know, we're the camera that goes in and we also had the time and fuel ratio set and I already set everything else up, so I have to do some testing and so we can record what we're going to do. in horsepower, which I don't know, so let's do some testing and see what we have and we're not going to put the air filter in.

I would like to do a test without the air filter so you can see how the secondary works. it opens up and runs on vacuum so we'll see how it goes with the top plenum and it is also and one other thing I want to say is it has the exhaust manifold with the thermal razor valve on my Kawasaki unit which didn't have that. So of course we might lose some horsepower on that, but it doesn't matter, it's factory, it runs, it's original, so I left it in the manifold just like it came from the factory, so let's see some real horsepower . after we build it we're going to compare it to what it had when it first got here and what the factory says the factory horsepower is 375 horsepower so now that we've done some work here in the next workshop let's see where we go to do. get and now we also have our oil temperature right here, I've plugged in the oil temperature, the water temperature, the fuel pressure in line, uh, line one, line two is not used, I don't want to ignore that one, we have the manifold pressure at idle that we know. it's sure to engage the brakes, here's our oil pressure at 1000 rpm at an oil temperature of 120 degrees Fahrenheit, here's our battery voltage of 13.8, so we're good to go.

All you need to do now is heat the oil and start doing the following. explosion, oh so should I say let's start from there? I know it's something that seems like I've been getting a lot of 440 motors lately. I have maybe 10 motors right here. 440 units. I have the A12 from Vancouver which is on a 69 69 and a half roadrunner, a 12 pack car with a pop up hood. I have a 440 Challenger. I have my original Kawasaki engine to build. I have a 440 here that belongs to Drew. I have the 440. to build for eugene from his uh charger 500. I have another 440 from james from madison uh I think it's crazy in Ontario since that 1970 b5 blue super b it's going to be a busy winter, never mind, you know, the Winter is near here so we'll do it one way or another and this is my favorite part to build engines with so I like to restore cars from time to time here and there if it's a rare part but in the meantime let's get going those engines. up and running so everyone can have their cars and engines by spring and I have to say it again, I have to give a special thanks to Todd who centered the boost valve or should I say the ball valve that works electronically all with the push of a button here.

I don't have to go back and open the valve and now we're ready to go and here we go, let's do our first test and I usually always do a back-to-back test. I usually never come to the first one. I would like to deep sync the block with heat before doing any testing so we just did an initial test and that's what we have let's go without the air filter and there we have it this is just our first test so now let's go . do another test in a row just to warm up the engine, which we just did, so let's do another test and let's go, are we ready?

Okay, here we go, well, you know what you want, warm up the engine, all right, you know. doing a test and taking the initial reading is not the way to go. I usually do a full speed test and then start recording everything in the test, so it was just a warm up test, so now let's start from here, here we go. So, like this, okay, let's see what we have here, come on, here's our first test at 5000 rpm. We just put out 398.5 horsepower and our peak torque right now is 484.4 at 3300 rpm. I think we could do better than that, cool the water let's do more testing here are our numbers water temperature and the graft is here.

I hope to get at least close to 400 like I did with my kowalski with my kawasaki 440. uh, you know, I'm surprised I did it. more than that, come on let's do another test, how's it going, here we go, so okay, let's do another test so far, no oil leaks there, don't forget that little oil spot you're looking at is my temperature gauge , so don't look. On that, I'm looking at the rear seal, other than that, everything is fine, here we go, so okay, let me take a look at it, I guess we need to warm it up, here we go, this one worked much better, here we go, at 5000 rpm, we throw I have 394 horsepower and the maximum torque is 493.4 at 3300 rpm.

I'm curious to do a test with the air filter on just like I did on my kawasaki, let's put it, that's where we get to, here we go, you know? This is not common to put an air filter on a dyno, but you know, this is the way it will work on the car. It will work with an air filter outside, so I have it here. It belongs to the car. It is a dual smoke factory air filter. so let's install it let's do some more testing we gotta make sure those doors are open you gotta make sure it's a double sniper call you know the door is closed for the winter but you know it's summer here we go here's our respite just like the factory comes here It's our air filter and since it's a Plymouth they call it a Super Commando if it were a Dodge it would be called a Magnum so there you have it this is a GTX it's made by Plymouth it's a 440. and let's go.

I cooled it down a little bit and we're going to do some more tests. This is something I don't do very often, but since I want to build a Kawasaki the same way I did, Andrew wanted the same engine that we built. my kowalski challenger this is how I finished it and I want to do the same thing I did with my car so this is exactly what I did and here we do it again now for Mr. Drew okay let's do another test with the air filter here we go oh two sensors on come on so Devon have you ever seen that on a dyno with an air filter it's really weird look at that so we lost some points with that hey here we go three uh, 388, that 4900 rpm?

I guess that's what 485 and 34.85 are. Factory torque is 480. This is on the 485. There you have it. Let's look at the graph and see what it looks like. You know, I've told a lot of people. from our customers, you know when they drive a car and they shoot with 400 horsepower, uh, it's a pretty decent horsepower engine with 400 horsepower nowadays, guys, because most of my customers are not racers, they are just cruisers, they know when they drive a car. with 400 horsepower like my kowachi challenger, everyone enjoys it and it's more than enough for a street car, a cruiser car, it's not like today's hellcat, which has all the electronics and so on, many times when you have a car with a thousand horsepower is not a friendly driver car on the street you get in traffic you go from corner to corner making a stop here and a stop there maybe some people can I doubt it you know I really find it hard to believe but let me tell you You know driving this with foreign horsepower like a gtx or like my challenger is going to be a pleasure and I just want to say that this drop of oil is coming from my oil temperature gauge right here which is right above it and of the rear seal.

On that, nothing at all, so Drew, if you're looking, there's your motor, now I'll get back to you if you want to detail the carpet or not, if I have time to do it, or should I say if that's okay. You have time to do it, but in the meantime there are your results, there is your engine and after now all I have to do is put a new coat of paint on it, put on the new wiring harness for the spark plugs, do some detailing and install it in the car and I want to thank you for watching us here on Nick's Garage and if you want to stay tuned for more information in the future, please subscribe to my channel and if you look below the video, I have a lot of products that you can buy so what want it, buy it, love it, use it and enjoy it and help spread the word about Nick's Garage and if you have some time, check out our Patreon page, we have additional content and you guys.

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