S550 GT350R Race Car Build Build Thread Profile - S550 Mustangs

[Black Boss]

My RH header is right against the frame rail with the engine installed fully to the left. I called ARH (thanks for the contact Scott) and apparently they recently made a design change and are shipping a new header.

Great customer service, BUT a real pain as I have to un-install, remove the wrap, re wrap and re-install.

 

[Kevin Guzniczak]

My RH header is right against the frame rail with the en I called ARH (thanks for the contact Scott) and they made a design change and are shipping a new header.

Great customer service, BUT a real pain as I have to un-install, remove the wrap, re wrap and re-install.

I hear you on the install pain. I wonder what the fit issue is they changed? It was fine in my car.


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[Black Boss]

Don't know what they changed, but depending on when I get the replacement header, this will delay shakedown by at least 2 weeks. While I enjoy working on the car, I hate having to undo stuff, with no net benefit. At least they have a fix...

 

[Black Boss]

Primed the oil system today. Removed the Oil Pressure sensor and used a pre-luber:

 

[8250RPM]

I know you’re pressure lubing the engine before start up.
Perfect!

But for future FYI
You can floor the gas pedal and press the start button to lube the engine prior to start up.
This cranks the engine over without starting it and builds oil psi.


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[Black Boss]

I know you’re pressure lubing the engine before start up.
Perfect!

But for future FYI
You can floor the gas pedal and press the start button to lube the engine prior to start up.
This cranks the engine over without starting it and builds oil psi.


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Yes, I use that procedure every time I change the oil. Figured as this is a brand new build that pre-lube was extra insurance.

Meanwhile, got the RH header out:


You can seen the foul location next to the tape:

 

[8250RPM]

Yes, I use that procedure every time I change the oil. Figured as this is a brand new build that pre-lube was extra insurance.

Meanwhile, got the RH header out:

View attachment 4931
You can seen the foul location next to the tape:

View attachment 4932

You have a pic of where it made contact with the frame rail ?

I receive my new headers tomorrow.


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[Black Boss]

My new RH header is due next week. I’ve literally just removed the wrap, and Nick asked me to mark the foul location:

 

[8250RPM]

Here’s my left side header in ARH jig.


Here’s my left header on my 16 track pack. Not the best picture but it kissed the heat shield.


Here’s the right side that would kiss the clamp during engine torque over.


When I receive my new set of headers I’ll install them on my 18R and check the fitment.



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[Kevin Guzniczak]

Here’s my left side header in ARH jig.


Here’s my left header on my 16 track pack. Not the best picture but it kissed the heat shield.


Here’s the right side that would kiss the clamp during engine torque over.


When I receive my new set of headers I’ll install them on my 18R and check the fitment.



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Wow that is too close. Mine have gap there. No hits under load. No false knocks.


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[Kevin Guzniczak]

What diameter headers are you both running? They offer 1 3/4 and 1 7/8 on the ARH site. I ordered 1 7/8 right from them and have adequate clearance with the vehicle.


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[8250RPM]

What diameter headers are you both running? They offer 1 3/4 and 1 7/8 on the ARH site. I ordered 1 7/8 right from them and have adequate clearance with the vehicle.


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Kevin
Like I keep telling you. I have the very first set of Gt350 headers, mine are 3 years old.
Things were changed since then.
I have 1-7/8”

But it’s obvious since Nicks newer set, ( I also know of a few others that are having clearance issues) someone or something isn’t being done right when made.

Since headers are hand made, its most likely who ever welded them together or when the tubes are bent is the reason why they rub.

Hopefully my new set provides more clearance. Not something I want to keep installing and removing.

ARH for the GT350 are the same mustang header from 2011-2018.
The only difference the GT350 headers have are
.062 wall thickness tube.

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[Kevin Guzniczak]

Kevin
Like I keep telling you. I have the very first set of Gt350 headers, mine are 3 years old.
Things were changed since then.
I have 1-7/8”

But it’s obvious since Nicks newer set, ( I also know of a few others that are having clearance issues) someone or something isn’t being done right when made.

Since headers are hand made, its most likely who ever welded them together or when the tubes are bent is the reason why they rub.

Hopefully my new set provides more clearance. Not something I want to keep installing and removing.

ARH for the GT350 are the same mustang header from 2011-2018.
The only difference the GT350 headers have are
.062 wall thickness tube.

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Oh I know yours was the first set. Just curious about the diameters


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[Black Boss]

Replacement header wrapped and installed today:

 

[8250RPM]

Replacement header wrapped and installed today:

View attachment 5110

Did you install it once before wrapping it? Any additional clearance?


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[Black Boss]

This one has about 10mm of clearance to the RH frame rail, with wrap. Wrap is less than 1mm.

 

[Kevin Guzniczak]

This one has about 10mm of clearance to the RH frame rail, with wrap. Wrap is less than 1mm.

That sounds more like it


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[Black Boss]

Installed the O2 sensors, Trans cooler lines, Starter and Engine Oil Cooler lines today:

 

[Black Boss]

Installed the Intake Manifold today:

 

[Black Boss]

Also got the Oil Breather in and connected the heater hoses to eliminate the heater circuit.