Gt40 intake build - Mustang Evolution

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Old 11-03-2014, 09:47 AM   #1
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Gt40 intake build

Okay so I have a 1994 mustang gt and I have been wanting more power out of it. I heard the gt40 intake is a good rout to go but I don't know how I would go about doing it. what I would need to get to do it?


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Old 11-03-2014, 11:54 AM   #2
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Gt40 intake build

Won't see much of a gain if any at all, what other mods do you have done to the car??
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Old 11-03-2014, 06:00 PM   #3
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My buddy's runnin a gt40 intake and 70mm throttle body on his 86. His car actually seems a little slower. Without the heads the intakes useless. He's also still running speed density, but since puttin the intake on his car it's been real inconsistent. If it was me, get the heads, exhaust manifolds, and do the whole top end at the same time.
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Old 11-03-2014, 06:33 PM   #4
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Quote:
Originally Posted by regattabluefox View Post
My buddy's runnin a gt40 intake and 70mm throttle body on his 86. His car actually seems a little slower. Without the heads the intakes useless. He's also still running speed density, but since puttin the intake on his car it's been real inconsistent. If it was me, get the heads, exhaust manifolds, and do the whole top end at the same time.

Where would I find all these parts?


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---------- Post added at 06:33 PM ---------- Previous post was at 06:32 PM ----------

Quote:
Originally Posted by Adogg View Post
Won't see much of a gain if any at all, what other mods do you have done to the car??

All I have is a custom exhaust


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Old 11-04-2014, 07:25 AM   #5
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I just did this build on a 94gt. I got the Heads & Intake off a 96 Explorer at the junk yard.
The Upper & Lower Intake were $45 each & the Heads were $47 each. I went on 1/2 price day so I got everything for $92 + Tax. If you get the Heads make sure you get GT40's & not GT40P's.
The P Heads require Special Headers & are a big hassle. The Heads & Intakes are pretty easy to find.
You'll need to change the Valve Springs on the GT40 Heads as they are weak.
You'll need about 2'-3' of Vacumm Hose & a T-Fitting & some Rubber End Caps to set your intake up to be a direct fit.
Your stock E7 Heads have Air Intake Ports on the back sides of the heads. Your Smog Pump Lines run to the back of the heads & to your Cats.
GT40 Heads DO NOT HAVE these ports. You either have to bend the lines a little & just bolt them to the empty bolt holes on the back of the heads...just for looks...in case you have to have the lines to pass emissions. -OR- You can remove the Smog Pump....But if you remove the Smog Pump you also have to remove your cats or you'll burn them up.
I bent the lines & kept my Cats.
You'll also have to get a Throttle Body Elbow Adapter to make the Intake all Hook up correctly. (((Don't Buy the Pro Products Elbow Adapter))) It will not work !!! It only fits the Typhoon Intake made by Pro Products. I have that Elbow & I'm out $100 because I ordered it so long ago & can't get my money back. Get the Edelbrock Elbow.
All together it will cost you around $400-$500 to do the Heads & Intake Swap.
Add 24# Injectors & a CAI & your 215 H.P. motor will be about 250-260 H.P.
You'll be able to use your Stock Mustang Push Rods.
Your Stock Throttle Body is 70mm & will work fine.
That's something you upgrade later when you have extra cash to just blow for a minimal gain.
I bought a Ford Racing E303 Cam for mine....but if you cam it you'll have to get it Dyno Tuned.
If I was to do this again...I'd leave the motor almost stock & Chip, Super Charge & have it Dyno'd.
You can see my engine build in "View My Pictures" in case you're interested.
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Old 11-04-2014, 09:20 AM   #6
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Hellish has some very good first hand knowledge. Also he has some great info up there but the stock throttle body on the 94-95 are 60mm just like the foxes. And actually they really are 58mm to 59mm. The MAF is 70mm.


Here is a good read.


Five.Oh Info : The Ultimate Ford GT40 and GT40P Cylinder Head FAQ
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1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
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Old 11-04-2014, 10:57 AM   #7
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Somebody must have changed my T-Body before I bought the car then as it's 70mm according to my calipar. It looks like a stock one to me as it doesn't say BBK, Holley, Edelbrock, Accufab, or anything on it. Only thing I can figure happened. Weren't the Stock Cobra ones 70mm ???
I'm thinking that's what I have.
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Old 11-04-2014, 01:03 PM   #8
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Naw the Cobra in 1993 had a 65mm TB and unfortunately the 94 & 95 had a 60mm TB and a 70 MAF.


Hellish you got lucky and the prior owner swapped a 70mm prior to sale.
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1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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Old 11-04-2014, 02:54 PM   #9
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Quote:
Originally Posted by smurf stang View Post
Naw the Cobra in 1993 had a 65mm TB and unfortunately the 94 & 95 had a 60mm TB and a 70 MAF.


Hellish you got lucky and the prior owner swapped a 70mm prior to sale.

Where/how would I find the size of mine to make sure?


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Old 11-04-2014, 03:09 PM   #10
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Disconnect your Intake Tube / CAI from your T-Body & Measure it with a Ruler. One side has Inches & the other side mm. That's the easiest way. I was looking into the T-Body Sizes & 87-93 had 60mm & 94/95 has 65mm Stock & the 94/95 Cobras had 70mm w/24-lb injectors from the article I read. Several things changed on the 94-95 Mustangs from the Fox Mustangs.
The Water Pump on 87-93 only has a 1/2" Shaft & 94-95 has a 5/8" Shaft. The Brackets for the Alternator & P.S. Pump are different, The Distributor is different. There are several parts that only fit 94-95 Mustangs & therefore make them slightly harder to find & just a bit more expensive.
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Old 11-04-2014, 03:19 PM   #11
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By the way Smurf....I'd like to thank you guys (You, GrumpyGT, Almost Stock & Scotty) for all your help getting through that build. If it weren't for you guys & U-Tube I'd of never been able to do it. It was the 1st time I ever touched a motor. I learned a whole lot from you guys.
Thanks Again !!!
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Old 11-04-2014, 04:05 PM   #12
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Hellish horse I could say the same thing because I was like you it was mu first build and im young so I littertaly didn't know anything if it wasn't for them and youtube I would've sold my stang as a part output

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Old 11-04-2014, 08:18 PM   #13
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Any time Hellish. It is some times a little intimidating specially with all the internet geniuses, gurus and engineers out there. One thing is that you have to go into knowing shiz is gonna break, get lost, forget to buy, mess it up and start over. Once you get past that fear and chip your first nail it is all gravy from then on out.

Trust me I haven't built hundreds of motors but have had my fair share of bloody knuckles with the cursing of everyones mom and their horses. Then you shut it down and start in a few hours or even the next day.
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1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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Old 11-05-2014, 09:36 AM   #14
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Okay so I have all this information about this build but where should I start? What should I buy first? Where should I look for it?


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Old 11-05-2014, 11:46 AM   #15
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The cheapest way to go about it is the junk yard just look for a explorer motor of the correct year and start I bolting it all. Or you could try cl and eBay might be a little more expensive but less working finding it.
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Old 11-05-2014, 11:47 AM   #16
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Gt40 intake build

I have a mild ported gt40 upper and lower and the intake elbow for sale. All of it's painted ford blue.
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Old 11-05-2014, 12:41 PM   #17
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Mountaineers & Explorers both have them. Look for the Heads with the 3-Bars. There are 3 Vertical Bars on the Narrow Ends of the Heads near the bottom next to the smooth edge. They will also be Stamped "GT" . Avoid the GT40P Heads unless you want to buy Special Headers & Plug Wires. GT40P Heads have 4 - Bars instead of 3. If you google this it will tell you which years have GT40 & which years have GT40P Heads. Then go get them & if you find them cheap enough buy an extra set to sell on Ebay. They sell Fast. $300 + $90 Shipping & they sell in 1 day & you make about $200 profit.
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