MAC Prochamber & Longtube problems!

dderek · May 15, 2009

WHY THE HELL DOESNT THIS FIT?

I already modified my prochamber so i cant send it back, i ordered this stuff ages ago and never had time to swap out my bad motor and check this stuff.
so i have no part numbers or invoices or anything.
and theres no part number stamped on the prochamber.

did i get a prochamber for an automatic car by accident? did i get a 5 speed 351 prochamber on accident?

did i get the wrong longtubes on accident?

Ive heard it took a little muscle to get it to line up but this is WAYYYYY off

ill have to go take pictures of the entire prochamber to compare

Turd Tops · May 15, 2009

How did you modified it?

dderek · May 15, 2009

oh, and i have twisted wedge heads, which have the same exhaust port height as stock heads

so its not an issue with cylinder heads causing the problem.

i measured from one end to the other of the header side pipes.
was 16 3/4" ?

dderek · May 15, 2009

Turd Tops said:
How did you modified it?

forgot to mention that

I cut off the tube for the smog pump hookup, welded it shut, and painted it so it wont rust.
you can see it in the cellphone picture above this post.

mackey · May 15, 2009

Are those MAC longtubes?

dderek · May 15, 2009

mackey said:
Are those MAC longtubes?

yes they are.
they go around the steering shaft.
and they are the bigger of the primary tubes.
they are suppose to be the 1 3/4" with the 3" collector.

and the prochamber is suppose to be the matching 5 speed one

Turd Tops · May 15, 2009

dderek said:
forgot to mention that

I cut off the tube for the smog pump hookup, welded it shut, and painted it so it wont rust.
you can see it in the cellphone picture above this post.

Maybe by doing that with the pipes not on the car they could have warped? I don't have experience with MAC. The last time i installed long tubes and pro-chamber it was a Bassani kit.

mackey · May 15, 2009

My advice would be to call MAC and see if they can give you the measurements from the prochamber you wanted and ask them about the fitment. That is extremely far off.

I also noticed those two hangers on the H-pipe. Does the fox have the rubber hangers for them by the k-member?

It doesn't look like you do. Those hangers are the same ones on my SN95 (94 GT)

dderek · May 15, 2009

Turd Tops said:
Maybe by doing that with the pipes not on the car they could have warped?

not even a chance, they are exactly where they were before the cutting or welding

dderek · May 15, 2009

mackey said:
My advice would be to call MAC and see if they can give you the measurements from the prochamber you wanted and ask them about the fitment. That is extremely far off.

I also noticed those two hangers on the H-pipe. Does the fox have the rubber hangers for them by the k-member?

It doesn't look like you do. Those hangers are the same ones on my SN95 (94 GT)

mac had no prochambers in house to measure to tell me anything, i was hoping somebody here had one to measure?

the hangers are suppose to go on a bracket that mounts to the transmission, although ive never seen the bracket and down own one.
I need to pick one of those up somewhere

mackey · May 15, 2009

That makes me think you got the SN95 pro-chamber.

Stage 3 Motorsports 1979-93 Mustang 5.0L 2.5" MAC Short ProChamber (5 Speed, Aluminized)

This MAC from a 87-93 has no hangers.

dderek said:
mac had no prochambers in house to measure to tell me anything, i was hoping somebody here had one to measure?

the hangers are suppose to go on a bracket that mounts to the transmission, although ive never seen the bracket and down own one.
I need to pick one of those up somewhere

mackey · May 15, 2009

Looking at it one more time, I think the MAC h-pipe is the wrong one seeing how far the pipes are apart. I'd take it to a professional muffler shop to get it fixed.

Turd Tops · May 15, 2009

The bassani had those same hangers on the pro-chamber. Wish i knew more about MAC. IMO there supposed to be there. even on the 87-93

dderek · May 15, 2009

mackey said:
That makes me think you got the SN95 pro-chamber.

Stage 3 Motorsports 1979-93 Mustang 5.0L 2.5" MAC Short ProChamber (5 Speed, Aluminized)

This MAC from a 87-93 has no hangers.

good eye good eye good eye!

thats definately something i will check in the morning once mac is open

sucks i spent $300 on this center + welding + paint to have the wrong ****

dderek · May 15, 2009

I reallllly dont want to take it to a muffler shop and have them wack and mangle the prochamber more
especially if its just the wrong part number.

i just checked macperformance.com, and they show their 79-93 prochambers with hangers
so F me, thats not the problem

mackey · May 15, 2009

Are LT headers on foxbodies at different heights? Just looking at yours it looks like one of yours is at least two inches higher than the other.

mackey · May 15, 2009

I don't even think that could be whacked to fit, most likely cut and welded

dderek said:
I reallllly dont want to take it to a muffler shop and have them wack and mangle the prochamber more
especially if its just the wrong part number.

i just checked macperformance.com, and they show their 79-93 prochambers with hangers
so F me, thats not the problem

1991notchbackLX · May 15, 2009

for what it's worth, i have BBK longtubes and bought the corresponding prochamber, i had fitment issues just like you did... i brought it to an exhaust shop and he made an elbow-like adapter to mate the two flanges, wasn't expensive and sure saved my ass

Turd Tops · May 15, 2009

mackey said:
Are LT headers on foxbodies at different heights? Just looking at yours it looks like one of yours is at least two inches higher than the other.

The drivers side does look to hang a bit low and off to the left compaired to the passanger side.

dderek · May 16, 2009

well maybe the prochamber is just fine, and theres soemthing wrong with that set of headers?

i just need to find out a way to tell

MAC Prochamber & Longtube problems!

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