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Poll: Which is the most performance restrictive aspect of a stock 87-95 5.0?
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Which is the most performance restrictive aspect of a stock 87-95 5.0?

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Old 09-12-2002, 11:38 AM   #1 (permalink)
95mustanggt
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Question Which is the real limiting factor on a stock 5.0?

Considering were I am with my car and my available cash flow, this is a pretty important question.
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Old 09-12-2002, 12:12 PM   #2 (permalink)
Dark_5.0
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Some people go into the 11's with the stock cam, it is actually pretty good for a stock part.

I will break into the 12's here pretty soon with ported stock heads,explorer intake and stock cam and rockers.

I think the intake is the most restrictive part of the stock 5.0 engine.

Adding an aftermarket intake with a 65mm TB is good for a few horsies which proves that the stock intake was choking the stock heads somewhat.

Obviosly the heads have the most effect on performance if You put AFR 165's on with a stock intake there is no doubt you would go quite a bit faster but you will not reach your full potential.

Heads and intake should be upgraded at the same time. So that your car reaches its full potential.

JMO,
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Old 09-12-2002, 12:46 PM   #3 (permalink)
302 LX Eric
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I voted for both the intake and heads.

When I bolted up my GT40 intake, 65 TB, 24#ers, and 75mm Bullet, I was expecting a huge gain and just didn't see it - this was with the stock E7TE's.

As soon as I installed the TFS TW heads and Steeda cam the car came alive.

As Dark 5.0 has said and done, it is possible to see gains with ported stock heads, and new intake, etc. but it will be 'harder' to do.

If it were me, I would save up the cash to do everything (read: intake, heads, maybe a cam too) at once.

Good luck with your decision.
E
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Old 09-12-2002, 01:38 PM   #4 (permalink)
95mustanggt
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Thanks guys. I was thinking ported heads with stock cam/intake. But I'm not spend time and money (gaskets and seal) to get very marginal gains.
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Old 09-12-2002, 02:16 PM   #5 (permalink)
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I porteded the exhaust on my cylinder heads, changed to a trick flow street intake and put on headers/dual exhaust and it made my car come alive. The power used to literally DIE after 4500 and now my best times come when i shift at 5500 (which it actually pulls up to). It's best to get the heads/intake together because you will see MUCH better power gains, but i got a noticable kick in the pants with what i did.
...then again i also had 1.7 roller rockers, CAI, 73MM maf and 70mm TB before i added these things, so your results may vary.
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Old 09-12-2002, 03:12 PM   #6 (permalink)
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Money
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Old 09-12-2002, 04:45 PM   #7 (permalink)
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I have intake, full exhaust, and cam...

My car is DYING for some heads. I think the intake sucks ***, but I think it is the heads that really hold it back. When I added a new e-303 cam, intake manifolds, and headers I saw no improvement with my 1/4 mile times. Granted, the cam I got sucks with AOD (FINALLY going to start the swap to T5 tomorrow!). I know heads would really make my car come alive, which is why I voted heads. I agree intake is needed, but better gains come from the heads.

Ok, that was some serious rambling, but whatever!

Thanks,
DoranW
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[BBK X-Pipe]-[MAC Cat-Back Exhaust]
[MAC Cold Air Intake]-[BBK Equal Shorties]
[3.55 Gears]-[Cobra Intake Manifold (Upper and Lower]
[E-303 Cam]-[Granetelli Mass Air Flow Sensor]
[Front and rear sway bars]-[New black carpet and seats.]
[Adjustable Fuel Regulator]-[T5 Conversion w/ K. Cobra Clutch/Hurst STS]
[Cobra Throttle Body]-[130A Alt. Conversion]

Thinking about:
Aftermarket Heads!
Vortech A-Trim
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Old 09-12-2002, 08:48 PM   #8 (permalink)
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If you have an AOD i would definately suggest that you swap it for someting better. I swaped my with a T-5 like sonics is about to do and it made a major difference in performance. If you dont believe me, wait until sonics is through with his swap and see what he says.

Sonics, good luck with your swap, send me an e-mail if you have any quesions about your swap.
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Old 09-12-2002, 09:57 PM   #9 (permalink)
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I smoke cars with aftermarket heads cam and intake every weekend. The look on there face when I tell them I have stock ported heads and still run the stock cam is priceless.

I think I will always keep my E7's.

There are many stangs running 11's and 12's with the stock heads. They have potential if you know what you are doing.

The intake on the other hand is junk,

IMO.
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Old 09-13-2002, 08:32 AM   #10 (permalink)
302 LX Eric
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One thing that the E7's really lack is on the exhaust side. A guy at our track has home ported his E7's, and done the 1.7/1.6 thing along with full exhaust, pulleys, gears, etc. and has got in the high 12's with slicks. So, it's definitely possible. If you're on a really tight budget it might be worth it.

E
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Old 09-13-2002, 12:07 PM   #11 (permalink)
Sonics2042
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How much does it cost to port heads? Wouldn't it be worth just buying a new/used pair?

Thanks,
DoranW
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What I have:
1990 Red Mustang 5.0 LX:
[BBK X-Pipe]-[MAC Cat-Back Exhaust]
[MAC Cold Air Intake]-[BBK Equal Shorties]
[3.55 Gears]-[Cobra Intake Manifold (Upper and Lower]
[E-303 Cam]-[Granetelli Mass Air Flow Sensor]
[Front and rear sway bars]-[New black carpet and seats.]
[Adjustable Fuel Regulator]-[T5 Conversion w/ K. Cobra Clutch/Hurst STS]
[Cobra Throttle Body]-[130A Alt. Conversion]

Thinking about:
Aftermarket Heads!
Vortech A-Trim
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Old 09-13-2002, 12:25 PM   #12 (permalink)
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My vote was for the heads but we can't ignore the fact that changing both would be the best combo.
I changed to TW heads with the stock intake and gained a lot ot the track in the coupe a long time ago.
I changed to the Trickflow intake with stock heads and saw almost no gain on the GT. That was also a long time ago too.
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Old 09-14-2002, 11:37 AM   #13 (permalink)
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Do you still have the stock exhaust? On my 90 the exhaust made the biggest difference. 1 5/8" long tube headers and 2 1/2" exhaust made for a really noticable difference.
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Old 09-14-2002, 06:58 PM   #14 (permalink)
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Well
I think saying the stock intake sucks is mighty strong,long ago guys went fast with the stock intake and TFS Street Heat heads,this was before the GT40 intake came along,and it was guys flying then with stock intakes.

I will say this,you can always go better with what is out there right now,GT40 still makes a lot more torque than some aftermarket intakes out there,look at the Jan 2001 issue of MM&FF where they tested the GT40 against some heavy hitters in the intake world,it was the GT40 vs the TFS R,Holley Systemax,and Eddy Vic 5.0,the other 3 made more hp but the Gt40 made the most torque.

Sorry for the long answer,but it is too many guys out there going fast with stock parts to say they suck.
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Old 09-14-2002, 08:16 PM   #15 (permalink)
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The short between the steering wheel and the gas pedal IS the biggest restriction. This is not ment as an insult to anyone here. It is lack of knowledge that is the restriction. I currently have E7s. gasket matched on the intake and the bump removed fron the exhaust. I can assure any of you that I can go back to a stock cam and intake and still run twelves. I am not being a smartass, look over the spelling, I suck there, but I can make a car run on a burger king budget. I ran 112 mph wed night.
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Old 09-15-2002, 11:04 PM   #16 (permalink)
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Quote:
Originally posted by 88workcar
The short between the steering wheel and the gas pedal IS the biggest restriction. This is not ment as an insult to anyone here. It is lack of knowledge that is the restriction. I currently have E7s. gasket matched on the intake and the bump removed fron the exhaust. I can assure any of you that I can go back to a stock cam and intake and still run twelves. I am not being a smartass, look over the spelling, I suck there, but I can make a car run on a burger king budget. I ran 112 mph wed night.
Well said.........112mph is awesome with stock heads
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Old 09-16-2002, 08:11 AM   #17 (permalink)
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88workcar - gotta love the old speed density and the driver I'm curious, what's your race weight?

E
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Old 09-16-2002, 01:06 PM   #18 (permalink)
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Hey I got a question. Are those GT-40P heads worth buying? What do you think you could get out of them as far as max et? Thanks alot.

Dan.
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Old 09-16-2002, 01:58 PM   #19 (permalink)
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hey 88workcar , are you using nitrous ? i am also curious about the weight of your car when you race it , and what you got done to your suspension .
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Old 09-16-2002, 09:02 PM   #20 (permalink)
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Thank GOD that no one has taken my post wrong. I never wanted to upset anyone, but I want to get my point across. My car will get weighed Wed or Thur night this week. The last time I weighed it, it was 2900lbs with me in the car. Now it should come in at a high 2700lbs. I never post when my car has me stumped. But too weeks ago, the dist. went out. Now the torque boxes are demolished (OLD 1.5s 60fts) The biggest set back lately was that I spent $450 to have my old, big valve, ported, shaved, E7s redone and the gaskets and too days of wrenching. Only to fine that the head shop screwed me, one head is cracked. Yes they say that they checked them. Well today I called POWER HEADS, I thing that I am going that route. I want 12.00s on a pair of E7s. Yes I do have NOS, I don't have a cage so I don't use it at the track. I did bust a guys butt two weeks ago on the street with it.
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