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Worth spending money on a 289 for power?

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SnaKe:
Heya

I have a stock 289 in my 65 coupe. I want to have a bit more fun.

What would be the best bang for buck upgrades to the 289?

Is it worth spending money doing up the 289 or should I just get a 351?
Also, will the standard auto gearbox / diff / etc be able to handle a 351?

I've got a full custom exhaust with headers, other then that she's stock as a rock.. I just want a bit more grunt.

Tim175:
Some of the best things to do would be headers, electronic ignition, aluminum intake, aluminum heads, new cam, bigger carb etc. Personally if its the original 289 to the car and even if its not i would leave the 289 and just do some basic upgrades to it.

Soaring:
You will need to do some other things first before adding more power.  That 45 year old technology such as the undercarriage and rear end need to be beefed up first.  Subframe connectors would be a good starting point along with some 3:73 rear gears. You can make a monster out of that 289 if you add enough aftermarket parts like has already been addressed.  That 289 Cubic Inch engine equals to the size of a modern 5.8 liter engine.  And, the compression ratio is already 10:1.  I would just add a Weiand intake with a Motorcraft 4100 carb and some decent headers along with a dual exhaust system  with an "H" or "X" pipe.    If you can afford it, I would add a set of aftermarket aluminum heads, but that would make the engine worth more than it is worth.  Get the Pertronix I  electronic gnition system, and you will have all the power your seat can stand. 

Jeff73Mach1:
A 289 is not a 5.8, it is closer to 4.8 liters in displacement.

That being said, you have to define your goals.

If you want a 10 second drag car, you could do it with a 289, but it would be a high dollar specialty build.

If you want to take a light mustang and drive it aggressively from time to time, but don't need to run 0-60 in under 7 seconds or 13 second quarter miles, then building that engine up makes sense.

First and foremost, before adding parts to make an engine stronger, you have to be sure the bottom end is in good enough shape that the additional power won't break something.

Headers are good, better intakes are good, larger valves and mild port work is good-all of these improve airflow and allow your engine to get more fuel and air in and out.  However, unless you have a good performance camshaft-all these modifications are reduced in value.  Also your carburetor will need to be rejetted by someone that knows how to work on these carbs in order to be able to keep up with the changes.

Keep in mind that while these modifications might help you gain 75-100 horsepower, you still will have your stock transmission and rear end-if they aren't up to snuff, they will quickly let you know behind a fresh and more powerful motor.

Aluminum heads are nice, they are lighter and have revised porting and modernize your engine to some degree.  I think lots of folks use them because they are easy to buy, complete and ready to go.  But a good head builder can port and put larger stainless valves (and hardened seats) into a set of iron heads for somewhere in the neighborhood of 6-700 bucks.

Also cast iron heads seal better and are less prone to head gasket failure under hard use and because they retain heat, they actually make an engine more efficient.  Beware of cheap aluminum heads.

Ford made some good later model heads for the 5.0 I believe they are the GT40P heads and they flow very well and are easy to find at a good price and will bolt to your engine, though you will need to find tri y headers or stock manifolds for clearance of the revised plug location.


All of the modifications have to work together though and you will want to plan all of the work before doing the first thing.

Good luck

Soaring:

--- Quote from: Jeff73Mach1 on April 13, 2010, 03:41:13 PM ---A 289 is not a 5.8, it is closer to 4.8 liters in displacement.

That being said, you have to define your goals.

If you want a 10 second drag car, you could do it with a 289, but it would be a high dollar specialty build.

If you want to take a light mustang and drive it aggressively from time to time, but don't need to run 0-60 in under 7 seconds or 13 second quarter miles, then building that engine up makes sense.

First and foremost, before adding parts to make an engine stronger, you have to be sure the bottom end is in good enough shape that the additional power won't break something.

Headers are good, better intakes are good, larger valves and mild port work is good-all of these improve airflow and allow your engine to get more fuel and air in and out.  However, unless you have a good performance camshaft-all these modifications are reduced in value.  Also your carburetor will need to be rejetted by someone that knows how to work on these carbs in order to be able to keep up with the changes.

Keep in mind that while these modifications might help you gain 75-100 horsepower, you still will have your stock transmission and rear end-if they aren't up to snuff, they will quickly let you know behind a fresh and more powerful motor.

Aluminum heads are nice, they are lighter and have revised porting and modernize your engine to some degree.  I think lots of folks use them because they are easy to buy, complete and ready to go.  But a good head builder can port and put larger stainless valves (and hardened seats) into a set of iron heads for somewhere in the neighborhood of 6-700 bucks.

Also cast iron heads seal better and are less prone to head gasket failure under hard use and because they retain heat, they actually make an engine more efficient.  Beware of cheap aluminum heads.

Ford made some good later model heads for the 5.0 I believe they are the GT40P heads and they flow very well and are easy to find at a good price and will bolt to your engine, though you will need to find tri y headers or stock manifolds for clearance of the revised plug location.


All of the modifications have to work together though and you will want to plan all of the work before doing the first thing.

Good luck

--- End quote ---
Yeah, you are right.  The 289 is a 4.7 liter engine. The 351 is a 5.9.  My bad. 

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