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1994-1995 5.0 Mustang SN95 Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


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Unread 08-18-2010   #1 (permalink)
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Default will E303 cam work with 1995 Mustang Cobra heads and intake

I found a 95 cobra at a junk yard and want to get the heads and lower intake off of it and i was wondering if a e303 cam would work and what i would have to do to get the best performance out of them.
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Unread 08-18-2010   #2 (permalink)
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port them, and a e303 would work just not the best,
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Unread 08-18-2010   #3 (permalink)
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whats the best cam to match the heads and how much to port the heads
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Unread 08-19-2010   #4 (permalink)
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Cam depends on intake as well as heads and hp goal?
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Unread 08-19-2010   #5 (permalink)
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im gettin the intake and heads off a cobra. And would like to get about 300 hp out of it but im also putting on a full bassani exhaust and headers.
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Unread 08-19-2010   #6 (permalink)
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You aren't going to get 300 hp just by bolting those heads and intake on and doing an exhaust.

They need to be thoroughly worked over by a competent person to get to that level.

In their stock form, those heads and intake will net you 30-40 additional hp. 215 + (30 to 40) = not close to 300. And that is prior to considering loss through the drivetrain...

It can be done, though. Just not as easy as bolting them up.

As for the cam...

It has been reported that the E303 cam is a potential nightmare waiting to visit itself upon unsuspecting owners of sn95 Mustangs. There are rumors that the computer in an sn95, when it realizes that there is an E303 cam in its presence, becomes possessed by the demon of crappy idle quality, poor driveability, and worse performance than before. Although it will not puke out pea-green soup at you, this demon should not be overlooked. Of course, there are those folks who claim their computer was blessed at the manufacturing plant, and as such demons do not dare mess with it, but I have never seen one of those driving down the road. I have talked with people personally who literally threw the cam away because of the presence of said demon...

it does not sound like you are going to tune it. Nor do you need to, unless you put in the E cam. Then, it may be required. Not necessarily, but maybe...likely...probably...

In all honestly, for a GT40 setup, keep the stock cam. Get some roller rockers instead.

DUH - its a Cobra at the junkyard - it has rockers...right?
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Last edited by alleymad95GT; 08-19-2010 at 11:44 AM. Reason: I'm an idiot
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Unread 08-19-2010   #7 (permalink)
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b303,ported gt 40 heads of a cobra, ported cobra intake, 9.7:1 comp custom efi tune
be ware the computer does not like cam changes with the stock tune. My car made 190rwhp with the new motor and would not idle correctly. After tuning the car it still is a bit rough with cold start ups and idle the driveablity of the car went way down. Its more of a racing motor now than a street driver.
The tune is not cheap at all but this will give you an idea of what RWHP you should get out of this combo.
The gt 40's had major porting done, who ever did it did a great job. I spent 30+ hours porting the intake my self.
If you got the money spend it on the cam. The b303 makes power from 3000-5600 rpm.

or just go buy a 32 valve cobra and get the driveablity,power and revs and grandma can ride in the car too.
Agian the motor will not make the power with out a custom efi tune plan on $1k for a tune.
The guys that say they never had to tune their cars after h/c/i are full of crap and have low #'s the above post is right on the money.
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Unread 08-19-2010   #8 (permalink)
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Quote:
Originally Posted by Mustangjustin86 View Post
whats the best cam to match the heads and how much to port the heads
For the GT40 setup, an aftermarket cam really won't make enough difference to justify the cost and effort of a cam swap. The best cam for the GT40 setup in my opinion is the stock cam with 1.7 roller rockers (or you can just use the stock Cobra roller rockers which are 1.7 rollers).
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Unread 08-21-2010   #9 (permalink)
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Now if i get the heads and intake would i have to change the computer and mass air senser
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Unread 08-23-2010   #10 (permalink)
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NO.

You never have to change the computer unless it dies, which can happen, but not very often...now a tune is a different matter...

You will not need a tune. You will not need to change the MAF. There is no need to change your injectors, hence no need to change the MAF, and hence no need to tune it...

You should only contemplate changing the MAF if you get bigger injectors, in which case you have to change the MAF (and should think about a tune, although it may not be necessary in certain circumstances) or if your MAF breaks (which can happen).

Just as an FYI...

The injectors in the Cobra are 24#ers compared to your stock 19#ers. But, the MAF is identical. So, if you think you can get away with swapping the injectors and MAF from the Cobra to your GT without any issues, you are thinking incorrectly. The Cobra computer is the piece that accounts for the larger injectors, not the MAF.

In case I wasn't clear before, just leave the injectors and MAF alone for now. You won't be making enough HP to justify the cost and time to upgrade the fuel system with those heads and intake. JMHO.
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Unread 08-23-2010   #11 (permalink)
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Ok thanks u been a big help. So just keep everything stock except the heads and intake.
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Unread 08-24-2010   #12 (permalink)
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Now what if i port my stock heads and put 1.7 rockers on. And put on underdrive pulleys and longtube headers. Would that work.
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Unread 08-24-2010   #13 (permalink)
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Pretty much anything will "work"...the sky is the limit as far as what you can do...it just really depends on what you are shooting for to be totally honest...

The E7s, as crappy as they are, can be worked over to make pretty decent flow numbers. Not earth shattering by any means, but decent for sure.

Here is roughly how I would rank head upgrades (keeping in mind that all of the other supporting pieces need to be there)...

Stock E7s (bottom of the barrel)

Ported E7s / GT40 / GT40P / - nice budget upgrade. You may be able to get the E7s to outperform the GT40 heads, to be truthful. Now, I would put the GT40X in here as well. For the price, you see why they suck since they compare with ported E7s. I won't even consider them further.

Perfectly Ported E7s / Ported GT40 / Ported GT40P / Out of the Box Cheap Aluminum Heads - some people may be able to port E7s to compete at this level. This is, IMHO, about the best you can get out of the E7s with everything perfectly matched.

Perfectly Ported GT40 / Perfectly Ported GT40P / Out of the Box Quality Aluminum Heads - this is the rare set of GT40 heads that can make 300 rwhp. They can compete with TFS, AFR, and the like heads out of the box.

Quality Aluminum Heads with port work - nothing made by Ford will compete here. At this level, you are likely to have serious money invested in the car and think it foolish to talk about iron heads.

Keep in mind, all of this depends on everything else you have done to the car. Intake and any port work there, cam, and the like. You will never maximize any part unless you have all of the other parts to go along with it. My little categories ASSUME that you have the appropriate supporting pieces for your heads. That is, you can spend tons on TFS heads, and if you have the stock cam, they will not reach their potential.

Personally, you have to look at the pieces that make up your top end as a sort of continuum. Each piece will, eventually, reach a point where it cannot be improved to make more power. Dollar for dollar, the cost to make any given HP number is likely about the same. So, your perfectly ported GT40s and the correct supporting pieces will likely cost about the same as a quality set of aluminum heads. You lose nothing at that point if you go with the GT40s. You lose when you decide you want more and then realize you have to eat all of that money you put into the GT40s and buy some aluminum heads. You can't recover the GT40 investment you thought was what you wanted and turned out to be inadequate.

Make sense?

I don't think you will ever get to 300 rwhp with the E7s, even in their most optimal running condition...
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2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

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