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Unread 02-09-2010   #1 (permalink)
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Default 289 4 Barrel Setup?

Hi, since my old stock manifold stripped, I thought that instead of going ahead and taking out the old manifold, putting in some heli coil and risk it being damaged again, I might as well get a new one .

I was thinking of the edelbrock performer intake with either a 600-650 cfm carb. I found a nice deal for both. Will I notice any performance changes?

Anyone recommend anything else?

The motor is in a 1966 mustang and is a plane C code.

I want to make sure that if I do this upgrade, I do it right so I don't have to have any redo's :run_over:.
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Unread 02-09-2010   #2 (permalink)
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What exactly is that you have currently?
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Unread 02-09-2010   #3 (permalink)
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The stock 2 barrel manifold and carb.
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Unread 02-09-2010   #4 (permalink)
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It depends on several factors. I've started with a C code also and made some changes which helped but admittedly need more. I went to the Performer intake manifold, Holley avenger 570CFM, Performer + camshaft, roller rockers, dual exhaust, pertronix ignition and my performance is better.

In your case, how many miles on the motor, are the heads stock 66 heads, dual exhaust or single exhaust? Are you using the stock log exhaust manifolds? If the motor is high mileage, heads stock and using the stock log exhaust manifolds, then in my opinion your carb will be on the big size if going to 650CFM. You'll be better off with no more than a 570CFM. If I had it to do over again, I wouldn't buy a Holley, and probably would go with Edelbrock, because I'm not happy with my Holley. Edelbrock has kept up with technology more than Holley and my personal opinion is Edelbrock is a little better, especially since you mentioned going with the Edelbrock manifold. Edelbrock went to great lengths to build and test these components together to get the most out of them. The Performer is a good street manifold and if you were to go a step further and replace your cam with the Performer + this would also boost performance. If you have a high mileage motor, think long term........so you don't repeat your steps, which will spend more money. I'm speaking from experience, as this is what I'm doing right now. I started out with the C code, rebuilt it and left the dished pistons, mistake, should have changed out to flat tops. I rebuilt the stock heads, mistake, should have at least installed larger valves and ported and polished those heads. I kept the stock log exhaust manifolds, mistake, at least should have gone to HI PO manifolds. So you can see by my mistakes I'm trying to get you to set a long term goal on your motor to save time and money. Bottom line, if you have a worn out stock motor and over carb it, you performance could get worse.
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Unread 02-09-2010   #5 (permalink)
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I completely agree with Ranger. I have a Performer 289 manifold, and am very happy with it, but I swapped out my 600cfm Edelbrock for the stock Autolite 4100 480cfm. The Edelbrock is a great carb, just too big for my stock 302. Even the Hi-Po only used a 600. The extra CFM's are only good if your motor is built to rev high enough to use them; if it isn't, driveability suffers.
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Unread 02-09-2010   #6 (permalink)
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Here is the link to a website I used to determine what I needed. Like the guys before me, I went from a 2 barrel carb/intake straight to a 650 holley, bad idea Use the formula in the website Calculate Required CFM Of Carburetor and you will probably find you don't need anything bigger than a 500. I took the holley off, stuck on a edelbrock 500 and have been quite happy. Keep in mind when looking at Edelbrock carbs. They come out of the box setup for a sbc at sea level. They are easy to work on though. Pop the top and put in the correct hardware that the red manual suggests. I had purchased a used edelbrock performer 289 but found out later they aren't any better than the stock cast unit save for the fact they are aluminum. I took a chance on a "Shelby" intake on ebay but haven't gotten around to installing it to see how it works compared to my stock cast 4 barrel intake. I have heard good things about the Edelbrock air gap intake and the Weiand Stealth so if this intake doesn't cut it that will be the route I take. The bottom line is that it depends on what you want out of the car. Dual plane intakes are good for low end torque. Single plane intakes take advantage of the upper RPMs you would experience in drag racing.
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Unread 02-09-2010   #7 (permalink)
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Thank's so much for all the insight!

I do not actually know the actual mileage of the car, its either 88xxx, 188xxx, 288xxx :p.

The motor is very strong and runs like a champ, so I'm going to assume its at 188xxx (I hope I'm right!).

We already have an aftermarket dual exhaust on the car, and we are using the stock manifolds and heads, but a new distributor and coil.

This car is going to be a daily driver, so judging by what has been said, I think I might hold off on the new carb, but still get the edelbrock manifold.

Sound good? :?:
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Unread 02-09-2010   #8 (permalink)
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You will be happy with the manifold. What carb are you running now?
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Unread 02-09-2010   #9 (permalink)
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Quote:
Originally Posted by Joes72/65 View Post
You will be happy with the manifold. What carb are you running now?
It is the stock 2 barrel ford carb that came on every C code.

Is there anything I should keep in mind before I take off the the manifold? And tips, tricks, warnings? I don't want to ruin something else !
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Unread 02-09-2010   #10 (permalink)
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Then you have an Autolite 2100. It's a great two-barrel, I have one on my '72. Unfortunately, the Performer intake is for a four-barrel, and your carb will not fit without some sort of adapter plate, and any increased performance potential from the new manifold will be negated by running a two-barrel. Two barrels are great for reliability, simplicity, and fuel economy, (Especially the 2100!) but by their nature can't deliver much in the performance spectrum.
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Unread 02-09-2010   #11 (permalink)
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Quote:
Originally Posted by Joes72/65 View Post
Then you have an Autolite 2100. It's a great two-barrel, I have one on my '72. Unfortunately, the Performer intake is for a four-barrel, and your carb will not fit without some sort of adapter plate, and any increased performance potential from the new manifold will be negated by running a two-barrel. Two barrels are great for reliability, simplicity, and fuel economy, (Especially the 2100!) but by their nature can't deliver much in the performance spectrum.

OUCH that's a real kick in the pants.

Ahhh new carb it is then.
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