How Do I Get 300 HP Out Of My 73 302? - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 04-07-2010 Thread Starter
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How Do I Get 300 HP Out Of My 73 302?

I just bought a 1973 Mustang base model Mustang that has the Mach 1 ram air hood, and the Mach 1 stripe kit. It has a 302, that I'm not sure if it is the original motor. I was hoping someone could tell me how to get around 300 horsepower out of this motor... As far as I can tell, here's what it has...

Flowmaster Straight Pipe Exhaust
Headers
Edelbrock Torker II Intake
Edelbrock 4 Barrel Carburetor
Accel Super Cell Ignition Coil
...This is all I can see...

What's next, crank, cam...and how much? Oh, I don't have the money for a complete rebuild, and I can do most of the work myself. Thanks, Zak.
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post #2 of 10 (permalink) Old 04-07-2010
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It looks like you have a pretty good start, if it has a stock camshaft, you need a camshaft change, if you have stock heads the valve springs won't let you go much past 5500 rpm, so your going to have to make your power below that or change some valve springs and components. If you decide to change the camshaft, it may be time to overhaul the motor, you'll have to check several things to make that determination. Good Luck.
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post #3 of 10 (permalink) Old 04-07-2010
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Quote:
Originally Posted by ZakBradshaw View Post
I just bought a 1973 Mustang base model Mustang that has the Mach 1 ram air hood, and the Mach 1 stripe kit. It has a 302, that I'm not sure if it is the original motor. I was hoping someone could tell me how to get around 300 horsepower out of this motor... As far as I can tell, here's what it has...

Flowmaster Straight Pipe Exhaust
Headers
Edelbrock Torker II Intake
Edelbrock 4 Barrel Carburetor
Accel Super Cell Ignition Coil
...This is all I can see...

What's next, crank, cam...and how much? Oh, I don't have the money for a complete rebuild, and I can do most of the work myself. Thanks, Zak.
I'm guessing you mean 300 at the crank. 300 to the tires is going to take some work and money. More money more power. The torker 2 intake is a little overkill. I would put a performer rpm on it better throttle responce. carb is good if its a 600cfm. sounds like its pretty stock. cam I would go with a comp 260. if you have the money a good set of heads but if you go that rought do a rebuild. I takes some money and planning to build a motor right. I have a 289 in my 67 Cougar XR7 that's 30 over and its making over 400 horse at the crank. but I have some money in it aluminum heads, intake, high compression pistons. comp 280 cam. To put it simple you need to make all the parts work together not just one thing is going to make your goal. get a plan on what you want from your motor and stick to it. hope that helps you a little.
good luck

1998 Ford SVT Mustang Cobra
1967 Mercury Cougar XR7
1997 Ford F250 4X4 Supercab PowerStroke
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post #4 of 10 (permalink) Old 04-07-2010 Thread Starter
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Thanks guys. I don't want to do a rebuild, as this motor runs great...I was just hoping for more power... And yes, lol...at the crank. Like I said, I just got the car, so I'm not exactly sure about internals, but if I had to guess, I'd say it's about all stock. Zak.
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post #5 of 10 (permalink) Old 04-07-2010
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As you may be aware, the 66 Shelby GT-350 street version came with 306 H.P. The engine was a 289. It was not stroked, nor did it have major head work. It started as a 289 Hi-Po motor and was enhanced from there using a cam, carb and tri-y headers.

I realize that we measure horsepower differently these days, but nevertheless, I think you get the idea. A 302 is not a major departure from a 289. In addition to the items stated, compression ratio will be a factor. The Shelby 289 had a 10.5-to-1 ratio I believe; maybe 9.5-to-1. You can check it out.

In this day and age, assuming a healthy bottom end, a good set of breathable heads, correct carburation, a cam on the plus (+) side of "mild", a good set of headers and dual point or electronic igntion, combined with the correct compression ratio should get you there. It's almost ALL bolt-on.

Ed
In 1967, I was an original owner of a new 1966 GT350. I paid $4695. It was totaled in an accident in 1971. I still have the steering wheel.

Current project is a 1966 Fastback 289 that I have owned for many years.
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post #6 of 10 (permalink) Old 04-07-2010 Thread Starter
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Great!!! That's exactly what I needed to know, now any ideas on setups that would go along with what I've already got? What would be the best thing to replace first? Zak.
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post #7 of 10 (permalink) Old 04-07-2010
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If your motor is original and basically stock (internally) it was rated at a measly 136-141 hp @ 8.5:1 compression and only came with a 2 bbl carb.

At minimum I would change the cam (as stated above), get rid of that torker intake. It is only capable of making power above where you will run and it hurts the bottom end power. It a single plane intake (bad, bad. bad) and is rated to operate between 2,500-6,500 rpm. It is killing your bottom end grunt.

Then you need to get a set of GT40 heads and gasket match them. (minor porting) They flow nite and day better than the smog era head that came with you car. But what you really need to do first is to find out which heads are on the motor now. 1973 marked the first year that Ford super detuned the 302. Finding out what heads you have will allow you to find the combustion chamber size and compare it the size of the GT40 chambers. If the GT40 chambers are smaller, that would help you anemic compression ratio as well a give you better flow.

You said you have headers but I wasn't clear if you have dual exhaust. If not, you need them.

All these things you can do with the motor in the car. The only real drawback is that you would retain the probably dished 8.5:1 pistons. Ideally, you would want at least 9.5:1, at which you could still run unleaded regular.
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post #8 of 10 (permalink) Old 04-07-2010 Thread Starter
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The exhaust are true Flowmaster duals...
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post #9 of 10 (permalink) Old 04-07-2010
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I'd look at the edelbrock cam/head/intake packages. Take a lot of the guesswork out. They claim over 300hp with their set ups.
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Heads cam and higher compression will get you 300whp but power=money.
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