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Old 02-17-2004, 11:34 PM   #1 (permalink)
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I know there are not a lot of I6 guys here but I need some help.

I have two exhaust manifolds for my I6. One is a C3DE-8430-A and the other is a C8DE-9430-A. I know the C8 is from 68 and the C3 is a casting from 63. they are totaly different castings. First WHY and second anyone know which one is correct for a 67? BTW the engine is a 68 and I am trying to make it look like a 67 So I would assume the C3.

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Old 02-18-2004, 12:22 AM   #2 (permalink)
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my 66 has C3, so I would go with that.

James
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Old 02-18-2004, 12:25 AM   #3 (permalink)
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Both are from Falcons, I can tell you that. To be correct for a '67, I'd guess the C3 casting one. But to be correct for the engine, the C8. I don't know if there were any changes to the straight-6 in those few years, but I'd think it would be better to go with the C8 one, to stay with the engine, you know?
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Old 02-18-2004, 01:06 AM   #4 (permalink)
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The 65 through 67 Mustang 6 cylinder manifolds have one less longer bolt to mount it. The center two ports are different. I also believe the diameter of the exhuast port is larger on the 68. It may have been a design change due the early ones cracking.
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Old 02-18-2004, 03:34 AM   #5 (permalink)
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I'd guess that the early one came off of a Falcon, with the 144, or 170, instead of the 200. Even some of the early Mustangs came with a 170. So, I'm guessing that the early one may not flow as much as the later one. I'd go with the C8.
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Old 02-18-2004, 11:45 PM   #6 (permalink)
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My '67 200ci has the C3DE-9430-A.

HTH

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Old 02-19-2004, 02:48 PM   #7 (permalink)
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Thanks, I think that is the one I am going with. The C8 uint does seem to have larger ports and a bigger "box" for the 3,4 cylenders. But, My goal is to make it look like a 67.

Thanks,

Thomas
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Old 02-19-2004, 02:50 PM   #8 (permalink)
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it looks like you are correct. The 68 has larger ports and the center chamber is bigger. I Think I am going to use the 63 style though. It is correct for a 67.

Thanks
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Old 02-19-2004, 02:52 PM   #9 (permalink)
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Im trying to make the engine look more like the 67 style engine. Changing valve cover, air cleaner and what ever else looks like a 68. While the block and the intake show C8 the rest will/should look like the 67.

Thanks though,
THomas
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