Gt40P Heads with Mac Long Tube headers

dropteeth · Jan 10, 2024

I am getting custom spark plug wires due to the P heads that require 90 degree boots. since my car is apart would anyone know the answer to these questions below to get them made by the company? :

Length required for each cylinder (measured terminal to terminal, not end to end)

Boot style (M or F) and angle (90°, 135° or 180°) for each end (distributor and plug) for each cylinder (if cylinders vary)

Coil wire (if required) Length, Boot style and angle for each end.

85GTStangGuy · Jan 10, 2024

Labeling your questions A thru C, here's some input....

A - Buy, and then return (say from that South American river named company.... can't recall exactly what it is ) a set of M-12259-C301 plug wires (or whatever color) and measure them to get the exact lengths needed.

B - Distributor end needs 90° female boots for all plug wires. The boots are also going to be female at the spark plug end, but I don't know what angle boot works best with the P heads. I'll let someone else chime in with input there.

C - Coil wire would probably be required . Length will be a function of the coil location. Is it an intake manifold mounted coil or a fender well mounted one? I believe the coil wire would typically be a 90° female boot on both ends. Length dependent on previous question.

dropteeth · Jan 11, 2024

85GTStangGuy said:
Labeling your questions A thru C, here's some input....

A - Buy, and then return (say from that South American river named company.... can't recall exactly what it is ) a set of M-12259-C301 plug wires (or whatever color) and measure them to get the exact lengths needed.

B - Distributor end needs 90° female boots for all plug wires. The boots are also going to be female at the spark plug end, but I don't know what angle boot works best with the P heads. I'll let someone else chime in with input there.

C - Coil wire would probably be required . Length will be a function of the coil location. Is it an intake manifold mounted coil or a fender well mounted one? I believe the coil wire would typically be a 90° female boot on both ends. Length dependent on previous question.

Thanks for the reply.

So if I ordered Exact replida 5.0 302 wires and just asked them to put 90 degrees boots at the spark plugs this would work on my longtubes?

thanks!

85GTStangGuy · Jan 11, 2024

Dunno.... I just don't know what angle boot works best with the P heads. Which exhaust headers you'll be using may also be a factor. I'll defer that end of the wires to a "P headed" owner.

General karthief · Jan 11, 2024

I'll jump in and say I found that shorty headers work best for P head spark plug clearance, nobody has P head long tube headers anymore and plug boot clearance was an issue on two or three cylinders, you'll need some spark plug boot insulating condoms, DEI makes some.
I cut and modify my plug wires.

dropteeth · Jan 11, 2024

General karthief said:
I'll jump in and say I found that shorty headers work best for P head spark plug clearance, nobody has P head long tube headers anymore and plug boot clearance was an issue on two or three cylinders, you'll need some spark plug boot insulating condoms, DEI makes some.
I cut and modify my plug wires.

thanks. I have the Mac Long tube headers that from what I have read work great for these heads... just wasnt sure what people were doing with the wires. im reading that 90 degree boots would work just wanted to confirm what others are using.

limp · Jan 11, 2024

When I was looking at wires for my P head, shorty header 302, I was recommended some MSD Street wires Part # 5553..
8mm, 90 degree boots... These are a build to your length wire, but include the tool to attach the end...
I used a large pair of 14" pliers to squeeze them, but a Vice ( I do not have one) would work well too...
Very pleased with them... I believe I purchased mine at Summit....

Mindseye007 · Jan 14, 2024

dropteeth said:
thanks. I have the Mac Long tube headers that from what I have read work great for these heads... just wasnt sure what people were doing with the wires. im reading that 90 degree boots would work just wanted to confirm what others are using.

Are the headers 1 and 5/8th ?

dropteeth · Jan 14, 2024

Mindseye007 said:
Are the headers 1 and 5/8th ?

yes they are.

Mindseye007 · Jan 14, 2024

dropteeth said:
yes they are.

The Best Headers for GT40-P Heads on a Foxbody....

he installed Mac Long Tube Headers and used Taylor wires with a 45 degree boot.

https://www.summitracing.com/parts/tay-74258/make/ford

Spark Plug Boot Ends : Eight 45/135 degree
hope this helps you.

dropteeth · Jan 15, 2024

Mindseye007 said:
The Best Headers for GT40-P Heads on a Foxbody....
he installed Mac Long Tube Headers and used Taylor wires with a 45 degree boot.

https://www.summitracing.com/parts/tay-74258/make/ford
Spark Plug Boot Ends : Eight 45/135 degree
hope this helps you.

thanks for this info!

Gt40P Heads with Mac Long Tube headers

dropteeth

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85GTStangGuy

dropteeth

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85GTStangGuy

General karthief

wonder how much it would cost to ship you a pair

dropteeth

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limp

wrap a little cheese around it and its a done

Mindseye007

10 years still blowing strong

dropteeth

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Mindseye007

10 years still blowing strong

The Best Headers for GT40-P Heads on a Foxbody....

dropteeth

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The Best Headers for GT40-P Heads on a Foxbody....

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Gt40P Heads with Mac Long Tube headers

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wonder how much it would cost to ship you a pair

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wrap a little cheese around it and its a done

10 years still blowing strong

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10 years still blowing strong

The Best Headers for GT40-P Heads on a Foxbody.... ​

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The Best Headers for GT40-P Heads on a Foxbody.... ​

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