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Old 10-04-2009, 05:24 PM   #1
JC316
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Default Questions about a Mark VIII Engine swap.

Lets start by saying that I did search, but I couldn't find any solid answers. I was acting an ass and popped a head gasket on my car. Long story, but I am not changing the HG since I have had nothing but trouble with this particular motor in this car. Even after a rebuild (Knocking, coolant loss, etc) I would go with a PI motor, but I am taking it from a Pick U pull and Mustangs and PI's are damn near impossible to find. Mark VIII's aren't however, so I am thinking about putting it in my mustang.

I will be getting the long block for $119 so it's cheap enough.

What exactly is required for this swap and I mean REQUIRED, not "Get the 99 cobra heads cause they make more power". 280HP from the Mark VIII is plenty enough for me. So my checklist:

1. Will the stock Mustang wiring harness work?

2. Will the stock computer work?

3. Will the 2v accessories work? (A/C, Power Steering, etc)

4. Will the 2v clutch work?

5. Will the Mark VIII intake work, or will I need the Cobra Intake?

6. Will the 2V headers work on the 4V heads?

Thanks in advance.
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Old 10-04-2009, 05:27 PM   #2
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Default

Quote:
Originally Posted by JC316 View Post
Lets start by saying that I did search, but I couldn't find any solid answers. I was acting an ass and popped a head gasket on my car. Long story, but I am not changing the HG since I have had nothing but trouble with this particular motor in this car. Even after a rebuild (Knocking, coolant loss, etc) I would go with a PI motor, but I am taking it from a Pick U pull and Mustangs and PI's are damn near impossible to find. Mark VIII's aren't however, so I am thinking about putting it in my mustang.

I will be getting the long block for $119 so it's cheap enough.

What exactly is required for this swap and I mean REQUIRED, not "Get the 99 cobra heads cause they make more power". 280HP from the Mark VIII is plenty enough for me. So my checklist:

1. Will the stock Mustang wiring harness work?
Yes

2. Will the stock computer work?
Yes

3. Will the 2v accessories work? (A/C, Power Steering, etc)
Yes

4. Will the 2v clutch work?
Depends on your year and bolt pattern

5. Will the Mark VIII intake work, or will I need the Cobra Intake?
Get the Cobra

6. Will the 2V headers work on the 4V heads?

Thanks in advance.
1. Will the stock Mustang wiring harness work?
Yes

2. Will the stock computer work?
Yes

3. Will the 2v accessories work? (A/C, Power Steering, etc)
Yes

4. Will the 2v clutch work?
Depends on your year and bolt pattern

5. Will the Mark VIII intake work, or will I need the Cobra Intake?
Get the Cobra

6. Will the 2V headers work on the 4V heads?
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Old 10-04-2009, 05:43 PM   #3
disposablehero27
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I'm doing the same swap, motor is completely modular to my cobra, i belive its the cams/intake are the only difference. intake yes, and either entire heads, or just the cams inside. other than that, you have a cobra motor with a teksid block and forged crank
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Old 10-04-2009, 06:23 PM   #4
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Ok, what about the headers? I think that they will work because the passenger side one has the same part number as the GT, but the driver doesn't. I know that the Mark VIII on the drivers side has the catalytic converter attached to the header, so that may be it.

Doesn't the computer need to be flashed to a cobra since I have a GT, or does it work out of the box. Oh and I think I have the 6 bolt fly wheel.
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Old 10-04-2009, 06:44 PM   #5
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Quote:
Originally Posted by disposablehero27 View Post
other than that, you have a cobra motor with a teksid block and forged crank
Mark 8s do not have forged cranks.
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Old 10-04-2009, 07:22 PM   #6
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Mark 8s do not have forged cranks.
Yeah that. Also, one last thing, since Cobra intakes are hard to find and freaking expensive when you do, will the 97-98 Mark VIII Intech Intake work? I found several sites that said yes, but I wanted to confirm.
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Old 10-04-2009, 07:49 PM   #7
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Originally Posted by JC316 View Post
Ok, what about the headers? I think that they will work because the passenger side one has the same part number as the GT, but the driver doesn't. I know that the Mark VIII on the drivers side has the catalytic converter attached to the header, so that may be it.

Doesn't the computer need to be flashed to a cobra since I have a GT, or does it work out of the box. Oh and I think I have the 6 bolt fly wheel.
4v and 2v exhaust ports are different shapes so you'll need the 4v specific ones but IIRC everything else is the same.
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Old 10-04-2009, 08:47 PM   #8
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everything works together except the exhaust manifold, 2v and 4v have different ports... the wiring of the GT will need to be extended though... the only difference is intake manifold and camshafts. I am doing this swap to my GT and that is as far as I know.. it is almost a bolt on..
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Old 10-04-2009, 09:37 PM   #9
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Originally Posted by darkstarnes View Post
everything works together except the exhaust manifold, 2v and 4v have different ports... the wiring of the GT will need to be extended though... the only difference is intake manifold and camshafts. I am doing this swap to my GT and that is as far as I know.. it is almost a bolt on..
Nice. Will have to figure out something with the headers.
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Old 10-04-2009, 10:27 PM   #10
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whats to figure out??? use headers for a 96-98 cobra and youll be fine.
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