95 Mustang CMC2 build

[RWalter]

I'm currently converting the car from CMC to CMC2

I've got the gt40p heads but no shortie headers for it.

I've had an order in with MAC since July trying to get

the header they make specifically for this mod...they are

still not ready to produce one for me....and won't give me an answer

as to when in the future it will be available.

Does anyone know of another header that will work ( without

having to "dimple" it to clear the revised spark plug location on the

gt40p heads)?

Thanks

Robert

[sacabuche]

Won't the ford racing shorties fit?

[KiMifan]

FRPP did have a version that would fit. Make sure you get the right one because they made both at one time.

[Trevor571548534737]

Let me know how this goes. I am in the exact same boat. Is there a way to make 270whp with the stock heads in CMC2?

[KiMifan]

Doubtful with the parts and mods that are allowed, and it would take some work to get there with E7s even if cams and intakes were unrestricted. A set on standard GT40s may be a better option if you don't want the hassle of fitting headers to the GT40Ps.

[Adam Ginsberg]

Hey Robert - good to hear you are moving forward with your build!

 

As mentioned, Ford Racing makes a set of 5.0L shorty headers specifically for the GT40 "P" heads, but they aren't cheap - these, and these.

 

However, they are listed for 1979-1993 Mustangs, not the 5.0L SN95 vehicles. Check Summit Racing, JEG's and Ebay as well.

[RWalter]

Adam

The car is ready to go except for the headers. I'm calling Ford Racing tech tomarrow to find out if the M-9430-p50 headers for the '86-'93 Mustangs will work on a 95 and what the differences are.

Have a good Christmas.

......isn't it racing season yet?

Robert

[KiMifan]

The main difference will be the lack of the EGR tube bung on the passenger side. You could add one (cut it out of your stock header) or run with the EGR blocked. Otherwise, the differences would be very minor. The outlet location of SN95 and Fox shorty headers is the same relative to the engine block.

[JermBua]

The P heads are very different than the GT-40 heads. Obviously the plug angle (which I hear, it is hard to find a set of headers that will fit). Valve size is different. Combustion chamber is different. It is not the same head. I was thinking about running them. Some drag racers will say the E7 heads are better. But I think only for porting.

[Adam Ginsberg]

Here is a link to the different flow numbers and specs of various SBF heads.

 

The "P" heads have a slightly smaller exhaust valve compared to the regular GT40 heads.

 

BTW - Late Model Restoration (www.50resto.com) also sells headers for "P" heads. Shannon (owner) has been a big supporter of AI/CMC racing, and is a great guy to do business with. Hell, they are even selling brand new GT40P heads for $310 each!!! Given buying used heads can be a crap shoot, that's a pretty damn good deal.

[RWalter]

Well Ford Racing tech department advised me today that none of their headers will work with gt40p heads in a '95 even discounting the smog equipment they don't fit. Summit tech dept advised me that they don't have any that will either. Contacted Pypes same......so the search continues

Robert

[snakebit]

try here

https://ampperformance.com/ford/xcart/product.php?productid=1549&js=n

 

or here

http://www.lastcallracing.com/mac-performance-54158-1994-1995-mustang-gt-cobra-1-5-8-inch-ceramac-coated-unequal-length-shorty-exh.html

 

or here

http://gearheadgarageinc.net/cart/index.php?main_page=product_info&products_id=746

 

John

[JermBua]

If it was me, I would try those headers that Adam sugested. They might just fit with some slight modes. If not, you can send them back. The flow numbers look good for the p heads. I wish I would have seen those numbers. I have a friend that has a brand new pair in a box. He might sell cheap. The ford tech guys are just playing it safe. Question for Adam. Will these heads be legal at the nationals?

[Adam Ginsberg]

Will these heads be legal at the nationals?

 

GT40P heads are legal for CMC2:

 

2010 CMC rules, Section 8.5.3:

 

Ford 5.0 cars may use Explorer/Mountaineer GT40P heads and intake manifolds.

 

They are legal in CMC2, and not CMC, as they require headers.

 

Nice finds, JCoulter!

[KiMifan]

So here's the deal with SN95 headers on a Fox or vice versa. On a stock SN95 5.0L, the k-member is shifted forward about 5/8 inch. This is why the SN95 trans input shaft is longer. The X-pipe is also different to accommodate the revised location. However, if the engine is in the same location as a Fox, the Fox X-pipe will bolt up to SN95 headers. That I know for a fact, because I have done it. If a Fox X-pipe will bolt to SN95 headers, an SN95 X-pipe will bolt to Fox headers. You may have to shift your X-pipe and exhaust a little bit to line it all up, but the pipes will match up to the collectors.

[DrC]

That Is good info .

I have a 91 GT with GT40P Heads and the MAC Short header and they work well with their Pro-Chamber pipe.

It is running at 254 HP and 305 Torque at the wheel.

[JermBua]

Dan what intake are you running? I'm going to CMC 2 also. Any RD is priceless.

[DrC]

This is on my 1991 GT Rag-top (not 95 GT)

GT40 upper and lower with ½ in Phenolic spacer

Cold air kit with larger MasAir

1.7 Ford Racing Cobra Roller Rocker Arm Set

Still using 19lb injectors

390 rear gears

[JermBua]

Thanks Dan. Thats good info on the intake and injectors. I was thinking about changing to the 25 lb, but will stay with the 19 and bump the fuel pressure. Hope to see you out there next year. It should be a good year. You ever need somthing. [email protected]

[CMC#11]

Just as an example in my fox I am running the Cobra motor (GT40 heads, intake, T/B, M/A, roller rockers) and I also still run the 19 lb. injectors. In CMC last year I had to pull it back to get 230 hp / 272 tq. The tq fell a bit b/c of the high fuel pressure. This year I am switching to CMC2 and put in the e-cam, increased timing, and lowered the fuel pressure some. My goal is to make CMC2 numbers w/o running aftermarket headers. I did an event last weekend and the car seemed to pull very good and was equally as fast as other CMC2 cars down the front straight.

I hope to get it dyno'd in the next month and will post up numbers.

[JermBua]

Last year I ran gt-40 heads stock 95 intake, roller rockers, stock exhaust manifolds "cobra cam" Making 230 hp and 284TQ. Also ran high fuel pressure to kill the HP. I think you will need a good set of headers to make the numbers. I would really like to hear what you come up with. Are you running the 89 computer?

[RWalter]

Well here's the follow up to my header problem and the result of the mod

for anyone deciding to make the change. I bought the ford racing shortie header built for the gt40-p heads in a fox body. The passenger side went right in. The driver side was more difficult. I had to move the clutch cable engine bay mounting and the dip stick to clear the headers but it went in with a little time and effort. I used the standard ford racing plug wires and the clearance was good. The headers hooked right up to the mid pipes before the x pipe assembly. The explorer intake is taller than the stock intake and wouldn't allow the use of the stock strut brace. Bought a strut brace from Maximum Mortorsports which goes around the intake..fit perfectly. To get the intake to match up to the throttle body I got an elbow from Edelbrock designed for the sn95....matched right up to the stock position. Now all that is left is to have it dyno'd and see what kind of numbers I get.

[CMC#11]

Just as an example in my fox I am running the Cobra motor (GT40 heads, intake, T/B, M/A, roller rockers) and I also still run the 19 lb. injectors. In CMC last year I had to pull it back to get 230 hp / 272 tq. The tq fell a bit b/c of the high fuel pressure. This year I am switching to CMC2 and put in the e-cam, increased timing, and lowered the fuel pressure some. My goal is to make CMC2 numbers w/o running aftermarket headers. I did an event last weekend and the car seemed to pull very good and was equally as fast as other CMC2 cars down the front straight.

I hope to get it dyno'd in the next month and will post up numbers.

Dyno'd the car over the weekend and got 260/294, still running the stock headers.

[Adam Ginsberg]

Dyno'd the car over the weekend and got 260/294, still running the stock headers.

 

Thanks for the update, Michael - great numbers.

 

If you ever are so inclined, and already have the aftermarket headers, I'd be very interested in seeing before/after header numbers.