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.
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?
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.
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.
"Get your facts straight first, then you can distort them as much as you wish"!!
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.
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